here is my take
* chak de's focus was on 4 out of 11 players, so it disguised itself as 4+1 representing the 11... lagaan had much better focus on all the members
* chak de's touching of social issues was supeficial - more for entertainment than actual concern or any wish to change (they showed how north east folks are neglected but in the team itself the focus was not on any of them, they showed that a girl from rural area might not know english but that *very thing* was to generate some laughs, hoo!), lagaan was much more genuine in that respect
* chak de has its own cliches - komal giving the ball to preeti at the end with an idiotic dialogue, and preeti giving the favor back in form of penalty, or the guy who was shown with preeti was insensitive and rude to start with making the choice for preeti much easier...
* incidentally i took my team out for this movie and one of them has played hockey in inter IITs, i asked him about the technicality of the stuff shown in the movie, he said it was pretty much okay, nothing great, i believe that the movie was more about team spirit and a man's fight to get back his dignity than a sports movie... i wont say lagaan was a sports movie either so none of them scores over here...
* chak de has a feel good factor when india wins the world cup and all... i think desis like their teams to win even if that is on-screen :-)...
* chak de's ability to connect to youth is much more, primary reason being that it has a certain *cool/ young* look... though it does not mean it will inspire youth to do anything, just that it has better entertainment value for a youngster... (for that matter i dont think lagaan inspired ppl to do anything but chak de's the much better connection with youth lets them become animated for sure)... i think it took an RDB for people to go and stage a dharna at india gate...
* yashraj films know their game plan very well, they are going to cash on quite some moolah from this movie :-)...