As in, he bombed in Phantoms?

I haven't seen it. I like him better as a screenwriter than as an actor. The closest I've come to enjoying Affleck is The Town.
For all its awards, I thought Argo was overrated and rather unspectactular.

I like him best in Mallrats and Chasing Amy.
Jay and Silent Bob Strike Back was pretty good too, particularly the scene where he and Matt Damon are talking to the camera. When Dogma came out, I think the Kevin Smith "view-askew-niverse" had grown stale, but even that had some funny lines.

I guess I like him in the Smith movies because they're funny and less intense than anything else I've seen him in.