I wasn't expecting to like Robots as much as I did. But it's consistently funny and loaded with sight gags; I'm sure I missed many of them. The CGI is very good. Some scenes seem to be included mainly for the coolness of doing them in CGI. So you have to step back and just admire the tech stuff every so often.
The idea is—you may have heard—the world is completely populated with robots. Even the little birdies are little bird robots. And when two robot parents decide to make a baby, they do so literally, from parts. Double entendres abound. The robot world designers have filled it with rich detail, a lot of which (again) I probably missed.
The story is pretty much cookie-cutter: little guy takes on a huge corporate conspiracy. And you can't think too hard about it. Also, you can't think too hard about a fundamentally inegalitarian society where humanoid robots are "on top" served by a myriad of "lesser" robots doomed to fixed and limited roles throughout their "lives": phones, parking meters, traffic lights, etc. A robotic Marxist would have a field day, if he didn't lose his mind first.
Finally, I'm a sucker for any movie that has prominent end credits for sysadmins.