I've only seen the workprint and thus cannot fully contribute to the discussion. I thought it was pretty good from that. much better than the reviews it's getting. for a "prequel" there wasn't much character establishment. they basically presented the same wolverine we saw in the first x-men, fully formed, just sans metal.
also, there are now some gaps in logic and continuity in the first x-men, if this is to be taken as canon. the main one I could think of is if wolverine's brain was pierced after being shot at the end, wasn't there x-rays of his whole body in the first x-men movie showing all the metal on his body? the adamantium doesn't regrow. there should've been a bullethole in the metal in his skull.
which, of course, since that movie was made x years ago (x years, ha!!!! I'm a comedic genius!, THEY couldn't have foreseen. but that's on the new movie.
in closing, I absolutely knew they were going to have a prof x cameo. I just thought it would come after the credits. the scene at the end of the credits isn't really that worth waiting for.