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.