Panorama said:
(woow 100 posts, only took me just over 9 months)
Congrats!
I don't think Green Lantern was a lapse of Ryan Reynolds' acting prowess, but the result of poor writing, coordination, and judgement of the director. They had him revel in being some radical despot in search of his character, rather than write to bring him out as a character.
Deadpool's story by default would require him to characterize himself through his interactions with the characters, the plot, and the audience. It would be more or less in the realm of movies he's already accustomed to.