I agree with the Man of Pak. They trod the same ground over and over, and one of those patches of grass happened to be the overall suckiness of the film. I mean, every now and then it was very funny and when they came up with something unexpected I laughed a lot, but I thought that due to all the anger and farting noises, some riffing opportunities were missed-- what, no Spencer's Gifts references with the Gungan lightning balls? Sometimes a character would say something just bizarre or Lucas-awful, and I'd tense up all, "Yeah? Yeah?" and... nothing.
I thought there was a bit too much reliance on North Dakota/Asian accents/chicken noises/Kevin spewing/making up stupid names. Two or three times is a running joke. Four or more is a comedy rut. However, I certainly couldn't be anywhere near as funny as they were for two-plus hours of overblown CGI (how can you possibly beat "I appear in the name of transfats" and "He's the guy all the other Jedis go to for weed")?
I did wince a couple of times when they damned the entire movie in such broad terms, because I thought Ewan McGregor did a terrific job with what he had to work with and the lightsaber battle was pretty darn good. Although, I have to admit... sometimes stating the obvious is simply needed. I cracked up the first time Fakey Jake opened his mouth and Mike just kind of muttered, "He's terrible."