It takes a while to grow on you ... but it really does. It's fun. Steve Carrell doesn't try to be Don Adams (who could?), and, after awhile, that really starts to work. They do lots of the classic schtick, but in an updated way that works. (They do all the signature lines, with one exception ... but for the most part, you don't see them coming, which is good.)
I saw the original series in reruns as a kid ... and so, for me, it was very much an homage movie. I'm not sure how well it would do as a movie standing on its own. Of course, most of the rest of the people in the theater with us were kids half my age (sigh), so either it does work, or everyone else has seen it in reruns as well. (Heard a rumor they were on Nick at Night for awhile?)
Anyways ... for you young pups out there ... have you seen it? Does it work for you, too?