There's so many games some of them are bound to be close, plus some of the excitement comes from the fact that it obviously means so much to the players.
On the other hand over the last few weeks (I'm including conference tournament games) I've seen too many robotically executed offenses that move the ball aimlessly because none of the players are good enough to create a shot. I'm not saying all the teams or all the players are terrible, but the good guys are too scattered across the teams.