Well, that's up to you to decide for yourself, but as a fan of the original series starring Don Adams and Barbara Feldon, this movie was a lot better than I expected.
Obviously the series in the 60's is a classic, and probably many fans would think what I am saying is sacrilege, but Steve Carell is a comic genius in his own right, and although he has a different take on the Agent 86 character than Adams did so perfectly back in the day, Carell is hilariously funny in this film, and his supporting cast of Anne Hathaway (Agent 99) and a new character The Rock (Agent 23), are great comic foils, as well as funny in different ways as well.
This film holds to the campy humor of the original series as well, but what I like about the new "Get Smart" movie is the fact that a lot of the humor expands the boundaries of the original, and there are also some dramatic moments as well, for example, when Agent 86 has to deal with the disappointment of again being denied that sought-after promotion to field agent, he so badly wanted.
Lot of twists and turns, great action sequences, and a well-written script. Again, if you are a diehard fan of the 60's series, you will not be seeing a duplicate of that here, but then again, this is new century, so that is to be expected.
I'm actually surprised there was never a sequel to this movie, but that has more to do with the box office than anything else I'm sure.
Great way to spend a couple hours, if you want to just relax, laugh, and munch on some popcorn.