I thought it was a decent movie all in all. However the addition of two jar jar binks like characters was only a reminder that that's exactly how most kids act these days and I facepalmed right there in that theater and I facepalmed hard. I still have a headache. RC was cool up until he became a robotic version of Sam's chihuahua, Mojo.
Otherwise, the effects were awesome, the story held somewhat close to how I remember the series was as a kid, and I'd buy it on DVD just to see Devastator combine again. But we have youtube for that, don't we? :D