I saw it last night, and came out basically saying 'meh, OK' with a side of 'yuck'.
I enjoyed some aspects of it. The plot wasn't fantastic, but it was interesting enough. The clones were pretty cool, and I liked seeing the friendships the commanders had struck up with the Jedi. Obi-Wan and Yoda sounded good and I thought Obi-Wan was fairly in character. I liked his fight with Asajj, I liked Dooku (it helped a lot that it was Christopher Lee's voice). Ziro the very gay Hutt made me shake my head in disbelief, but I found him somewhat amusing. He was much less irritating than Jar Jar, certainly.
Ahsoka, though – yikes. I found her unbelievably annoying. 'Skyguy' and 'Snips' and 'Artooie' was just painful to hear. She was also incredibly bratty, and to me it just seemed unrealistic for a Jedi kid. Every time she opened her mouth I found myself cringing and thinking, 'A padawan would not talk to their master like that!' Yes, Anakin did, but I always thought the point was that Anakin was an exception, because he wasn't raised by the Jedi.
I admit, I was geeky enough to read the kiddie Jedi Apprentice series, and although the Jedi kids in it have their bratty moments, they're raised with a lot of discipline and respect for authority. This kid just came in guns blazing and started mouthing off to her brand new master and trying to boss him around. As someone else commented, Anakin was a legend. I just can't see a Jedi kid being so totally disrespectful to him, at least not before they'd been together for a lot of years and developed a friendship. Surely they could have had her be a bit mouthy without making it so over the top?
Honestly, the only way I could justify it to myself was to figure that it was just a plot between Yoda and Obi-Wan to get back at Anakin for being such a pain. "Most obnoxious kid in the Temple we have found for him. Punishment it is for being such a brat himself. Laugh at him often, you will, Obi-Wan."
And I know, she's there for the kids. But that's something else I just don't quite understand. When we were kids, we did just fine idolising Luke and Han and Leia, even though they weren't child characters. A character doesn't have to be a kid for kids to relate to them. It just seems like talking down to kids, patting them on the head and saying 'here's a character more on your level'. Sometimes I'm really glad I'm not a kid these days.
No offence at all intended to people who really liked it, of course! Just my opinion.