Yeah, Marvel's kept pretty close to most of the original source material, save for Hawkeye and Whiplash/Crimson Dynamo. And let's face it, Hawkeye's comic costume would look a tad silly on screen.
I really liked X1-X2 and The Wolverine, and half-liked X-Men:FC (save for the restrictions they were forced upon due to the original trilogy), but I wish Marvel would regain the film rights from Fox for the X-Men series, Spider-Man (well, Sony), and Fantastic Four.
I would really like to see a unified, blue/yellow X-Team on screen (First Class got close, but they were almost too uniform without enough individuality). I think a reboot using Apocalypse as the initial villain would be a great start at something fresh, but Fox will hang onto that franchise until their dying breath.
Also, I have limited hopes of a "Marvel Universe" crossover film one day that combines all the franchises against something like Galactus. Ooooh boy would that kick ass, but cost a fortune in royalties alone.