Does it deserve 10 stars? No, but I look at this as a thumbs up or thumbs down thing, and it's getting thumbs up, sooo...disclaimer there.
I really liked this and I accept that I am in the minority. It has the Terry Gilliam comedic feel to it and it has the Terry Gilliam acid trip feel to it... and even at it's worst that is still absolutely entertaining and a pure joy to watch.
Someone mentioned wide angle work before and, yes, it has a lot of that wide angle close-up work that can only really be appreciated by people that thought they could out Thompson Hunter Thompson in their youth... wink wink nudge nudge, if you know what I mean.
The only real draw back is that Damon doesn't seem to fit in his role, and he doesn't really seem to fit in a Gilliam film...but surprisingly Ledger seems perfectly at home in that kind of world and you get the sense that he enjoyed acting the part as much as you are enjoying watching him act the part.
And then here and there you get a joke, a sight gag, a little hint that reminds you that, yeah, Gilliam was in Python wasn't he? That's something that you'd see in the Flying Circus shoved in there. Almost to the point where you can't but stop and wonder if he was channeling Idle or Chapman for some of the dialogue and physical humor.
It's a Gilliam film, made for adults, with Warner Brothers Cartoon violence. It's trippy and fun and it might not be your cup of tea, but I loved it.