Did they go too far with buffing Iron Man 3*

Warbringa

No I think his rework is fair. I have played him multiple times in PvP and had no issue facing him. I normally target him first and deny him yellow and bring a good yellow user to take advantage of that yellow AP. Every once and a while he does get the yellow power off but normally it is too late to matter. In addition, you can usually match at least one and sometimes two of his countdown tiles, really reducing the effectiveness of it. He is almost always paired with 3* Cap which makes it more inviting because Cap is slow and denying IM his yellow makes that team really easy picking in PvP on the defense (it is a good team on offense I admit as I use it too).

Now I am mainly still in 3* land in PvP so when you throw 4* characters into the fold then I imagine it could change the balance but I would think he would be an even greater target when you have a 4* roster as you can kill him even quicker.

I would still stay Iron Fist is a better 3* than IM 40.