I can tolerate Jar Jar, but had I been in charge he'd have been much more subdued.
I'd also either have given him subtitles w/less dialogue, or he'd have been like Chewie and R2 where you understand what he's saying by the context of replies from other characters.
He's a well-drawn character though, that's for sure... One of the best CGI effects in modern film IMO. Just the concept fell a bit flat on how he'd behave. Could've been improved though, and he'd be an OK character then.