For me, first... the game seems repetitive and pointless. All Sims are virtually the same: no wants, fears, whims are gone, no romance feature, and trait impacts are laughable. In other games, at least I was working towards aspirations and wants/fears that made Sims different from each other... but being able to switch aspirations make them meaningless (as they are so easy to reach anyway), and don't get me started on the whims feature...
Then there's nothing to do with teens (I suppose that with Parenthood, kids are ok). They're like mini adults with absolutely NOTHING that distinguishes them as teens.
I've yet to see a pack that really improved gameplay either, sadly.