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.