Lovestruck

I never really saw any bugs but there does appear to be some - the answers page has about 14 listed.  That being said I don’t think it’s a particular buggy pack, the patch it came with caused some issues but it generally went down much better than for rent and growing together.  
As for the gameplay I really like it personally.  It has been criticised for not having that many features, there’s less to do than in life and death.  But I think what is there is really nice and all my sims have turn ons/offs, use the new dates and romance skill etc and it inspired me to build more bars and date spots.   Online dating is very good for getting new sims into your game quickly.

I think the CAS is the best in all the expansion packs.  I think the build is good but lacks some key items (no kitchen) but what is there is mostly nice.  I think the two traits are two of the best animations in the game (and there’s nice animations in general).  The world is nice and fine for a sim to live in.  It can feel a little empty but has a bit more to do than recent worlds like tomorang and San sequoia.  

I really connected with my sim I made for this pack.  That being said the pack is one of my favourites but it’s also divisive and not everyone feels this way so get some more opinions and watch some videos.

Honestly as for bugs and issues I don't know yet because I haven't ran it in my main save yet

but what I will say is that the pack is very invasive with gameplay features popping up all over the place
so unless the theme is really your jam I'd think it over for a bit just to be sure thats something you want 😂

I like the depth it gives to romantic storylines and it greatly enhances romance as a whole. It does come with a LOT of notifications and micro management though, so if you like this kind of playstyle, go for it!

To be noted, paired with all of the others EPs I feel like I get interrupted every 3 secondes, between notifications, popups and phone calls, and this EP adds a lot. You get a notification each time you discover one of the other sim traits because it constantly updates the chemistry between them 😆

It's more of a "things happening in the background" kind of pack than other packs, and some things are badly tuned (the default rate at which the "relationship satisfaction" decays, for example) so if you play on PC definitely get some mods that make the gameplay experience better. 

There are so many little things and details in the pack and it's really goofy in a sims way, which I really appreciate. 

If you like romance, it is a really good pack, and I love most of the new gameplay features because they just make sense, like the turn-ons and turn-offs, and the app is fun, too. There are new interactions that unlock once your Sims start maxing out their romance skill, and that can change the dynamics between two Sims. Personally, I just adore that they can now cuddle in bed and fall asleep cuddling - that's SO cute! 

I'm also using dates more often than before the pack because they are customisable, and that adds a lot of fun, too. Same with the blind dates. And it's just hilarious when one Sim in a couple isn't flirty at all yet tries to compliment the partner or interact romantically. In short, the pack adds a lot more depth to romance, and it actually ties in nicely with My Wedding Stories.

The only thing I really dislike about the pack is that relationships have become real work. I'm a rotational player with currently eight households, most of them couples, and my main couple who's been happily married and in love ever since I created them all of a sudden has to work on their relationships. I mean, it does make kinda sense that during the seven Sim weeks I spend with the other households they don't get to interact all that much and hence may be a bit dissatisfied, but sometimes that romantic satisfaction drops to almost zero within a few minutes once I'm back with them. That can be very annoying and stressful even though it's easily fixed with a date, but it still is very invasive. 

The pack also adds a nice challenge if you have a couple that's not one hundred per cent compatible for various reasons. When the pack came out, I created such a couple so I could play around with the new mechanics, and boy, is this a lot of fun. They eventually were so at odds with each other that they decided to try couple's therapy, with the result that the wife was like "Nah, that's a waste of time and money, I'd rather go ahead and flirt with that cute firefighter who saved our  house from burning down."

As for bugs, I haven't encountered any. If you're still not quite sure whether this pack is for you, you can always watch reviews on YouTube. Those can be really helpful. 

I would say it's more the patch that was released before Lovestruck that caused quite a few nasty bugs rather than the expansion itself. We have three critical eye bug issues going on right now since that patch. The shape of the sims eyes have changed and look off. The eyelashes that come with preset eyes are now lighter when they should be black and also make the eyes look off. Also, sims can no longer fully close their eyes when sleeping, blinking, etc. We're still waiting for a fix for all of these eye bugs.

I would say that now the pack is working. When Lovestruck first came out, it didn't always work as easily. I started playing Life & Death last week and noticed is that the Cupid's Corner is working, romantic satisfaction and turn-ons/offs are working, my sim can plan and go on dates, and all the romantic interactions seem to be working correctly. I'd go ahead if that gameplay is exciting to you.

It'll remind you of Growing Together because the gameplay is more subtle. It's romantic dynamics, turn-ons/offs, planning and going on dates, and finding your perfect partner. Just like Growing Together had family dynamics, social compatibility, milestones, etc are based on gameplay and interacting with other sims/worlds. If that's up your alley, Lovestruck is for you.