Here's the thing...If there's still any doubt that our popular culture has taken a nosedive, try comparing the Chipmunks from the 1960s and the 1980s vs. the abomination we have today.
I don't find the movies to be that much of an abomination (at least in substance) because Alvin and the Chipmunks never really had much to it. It was basically a recording gimmick that was anthropomorphized into cartoonish characters (and they did indeed look like actual Chipmunks wearing people clothes the way they are in the movie on the first album covers)...It was deemed worthy to be made into a cartoon in the 60's and again with more pathos in the 80's and 90's... I honestly think John K and the rest subtly commented on the 80's series in the Mighty Mouse cartoon they did (but this thread's not big enough to elaborate)...
Now, aside from "edgy" writing geared towards kindergarteners and poor casting of Dave, I felt the first Chipmunk movie almost a biopic of Ross Bagdasarian Sr, or at least an allegory of his struggles as a song writer up until he came up with the speed up sound for Witch Doctor. That became a novelty hit that created said cultural phenomenon. And then of course there was the commentary on what fame does and what record companies do to artists (Ian keeping Alvin and the rest in cages and taking all the money for himself is a perfect allegory of how big name labels exploit artists, leaving them to have to pay royalties on their own songs... even if they're lucky enough to be able to write their own songs). While not perfect, the first movie was enjoyable enough, but David Cross salvaged the film.
The second one was equal parts fanservice (adding the Chipettes) and trying too hard to be the 80's series. Yet, while the film had some nice little concepts, it failed overall due to Jason Lee not even thinking the paycheck worthy enough to be in the film the entire way, forcing the writers to add a horrid Marty Stu and Mary Sue romantic angle (even though they had the Chipettes and there was organic love story potential in there... same reason I hated Yogi Bear, BTW). once again, David Cross saves the film... Personally, I think Dave's loser nephew ruined the entire thing, not to mention it lost the potential to add Mrs. Miller in as their Babysitter...
The third one's plot seems almost like a DTV or TV special... the cartoon did the stranded on a desert island already, and better... I have no desire to see this... I almost snuck in after Tintin last night, but didn't even want to bother.
Still, I can't call these terrible... just meh and what you expect of kid's movies now.