Saw "I am Legend" last night.
Overall, a very entertaining movie and worth seeing at the theatre. It should get nominations for Sound and Sound Effects. Possibly makeup.
My only complaints are that there's a ridiculous amount of product placement in the 1st 10-15 minutes (which distracts from the action), there's not quite enough backstory to tie in everything that happened, and that the entertainment value largely depends on the audience's ability to suspend one's own disbelief. If you're able to do so, the movie is a 3 out of 4 stars; if you cannot suspend your disbelief so much, and you pick through the plotholes, it's a 2.5.
Wil Smith did a very good job, acting and action-wise.
Go see it...but at matinee prices.