I honestly don't see the big deal JA is making out of Ant-Man. It's not even like a lot of ppl are hyping up Ant-Man to be the next GotG. GotG is just an example not to doubt Marvel. Nobody is overly enthusiastic for the Ant-Man movie
If Ant-Man completely sucks then so what? Probably won't do horribly in the box office coming off Avengers 2. A few die hard fans will ***** and moan the same way they did after paying for IM2 or IM3 and then everyone will forget about it. The next time we'll probably see Ant-Man is on the next season of one of the netflix shows or AOS, and probably a death scene in Infinity War.
As of right now I'm pretty sure there still isn't even an Ant-Man movie thread. It's Ant-Man! I feel like even Marvel isn't all that concerned at this point. It'll do what it needs to do MCU wise and if it's a success then Marvel continues to look like geniuses if it's not it's gonna be among the likes of Cap1, Thor1, IM2, etc.
Ant-Man is a low risk, high reward movie.