Swigging from a flask is tropotypical alcoholic behavior, or it's pollyjuice. If we saw more of him using it as a coping mechanism, without prompting, maybe I'll be more on board. Contradictory is a much better term than inconsistent, I agree with that assessment. So often people confuse a character's inherent contradictions for poor writing that maybe my hackles rise a little whenever someone calls a character 'inconsistent'.
Wyl's got a classic fatal flaw, the most classic, hubris. I think we're meeting him on the rebound, or maybe we've yet to see him hit bottom.
I still think the delivery of his flaw falls short. Most of his issues are just him being complex, but the man with issues around his lack of usefulness a mile deep, now reduced to this incredibly weakened state... Takes it all perfectly well. What?
His struggles with spike and casual drinking don't really make up for it to me...
I'm sure there'll be more going on under the surface If you choose him as an origin character. As a party member, he's missing some scenes to round off the impression