Oh, Alex Proyas. I don't know if it's your direction, or if you just keep getting involved in projects where you steadily lose creative control, but your films always start with an incredible premise, and slowly burn out over their course of the runtime.
I, Robot is fun, and the action definitely has its moments. Will Smith does well enough with his character (though, admittedly, his character has some very cliched motivations and prejudices).
However, in discussing robot sentience, emotions, dreams, and more, Proyas is never able to really discuss, and show off, his themes. Instead, he vaguely points at them so we recognize that they're there, and then pivots to a large action set piece.
I get the feeling that Proyas is a very competent director, but his films always seem to balk at really delving into the themes he sets up, which leads to a deflated feeling of unfulfilled promise.