only appeal of ant man is his ties with avengers....other than that he sux,
They have four planned Avengers movies, but only have Robert Downey and Chris Evans through Avengers 3. They won't pay Downey, and it looks like any future Iron Man movies will have the role re-cast, or reboot entirely. Evans is retiring from acting altogether, and Marvel has signed Sebastian Stan for five movies, indicating that they will follow the comics and have Bucky Barnes take over as Captain America when Steve Rogers dies, likely in "Avengers 3".
They need Ant-Man to have some sort of continuity going on when they make "Avengers 4". So Paul Rudd is it. Avengers 4 will likely have:
Chris Hemsworth: Thor
Mark Ruffalo: Hulk
ScarJo: Black Widow
Jeremy Renner: Hawkeye
Sebastian Stan: Bucky Barnes/Captain America
Paul Rudd: Ant Man
So they need the Ant-Man movie to do well. They'll be introducing a new Captain America, have no Iron Man (unless they move Don Cheadle in), and the Hulk franchise has been a bust. Black Widow and Hawkeye are relegated to supporting roles, and only Hemsworth as Thor is a bankable star heading into Phase 4.
(sorry, I keep nerdy track of this shit)