Yes, the groups system is amazing. Just being able to manage the group and who's in it, tell them to go and do things together, helps keep Sims tighter so we can see the interaction we like and maybe get done what we wanted to get done. They required a system like this for clubs, so it was a very good call on them to bring this feature in for everyone by taking it just a bit further.
I'm definitely having some problems with Sims taking time to do things, but yet the game is faster in all areas. Might need some more tuning...