I just got a 5* iron man cover, my current roster is still in the 3* building stage. I have 3 champ 3* and have 4 or 5 with 9-11 covers not at max level. My 4* roster is very low, I have a few 1 covers, a few with 2-3 covers and my highest is currently CharlesX at lvl111 with 5 covers.
So my question is, is adding 5* iron man to my roster worth the increase in scaling I’ll experience or is it better to scrap the cover and continue building my 3 and 4 stars?
if you have a few 3* champs (or more) I’d say definitely keep. anything less than that and it will depend on how it plays, which I don’t know. 5tark is a top tier 5* according to those in the know, so I’d definitely keep him if at all possible.
Supposedly they’ve changed the scaling such that one-cover 5*s won’t wreck you. Roster him and see. He’s quite good.
I have a single cover 5* IM 
and it does really well paired with OBW and MNMag. IM tanks, OBW heals and steals AP, and MNMag feeds 
to both with his 
.