“As good as,” is a funny phrase. This isn’t a game of Top Trumps. It’s a game of strategy, and you make do with what you’ve got.
My maxed characters are: Spider-Man, GSBW, The Hood, Human Torch, and Patch. I could have maxed IM40 and The Hulk, but I chose not to spend the ISO. For a long time, GSBW was my only good one. Then I bought Spider-Man’s blue, and they were my team. After the nerf, I only had GSBW. I did not consider myself weak.
Sure, I didn’t do very well in Season II, but I chose my battles and I tried for the characters I needed.
You notice I’m not mentioning LDaken, LThor, Black Panther? I got them eventually. I’ll level them eventually. But in the meantime, I’ve discovered that Hood, Torch, and GSBW make a killer combo. Not great on defense, but quite capable of winning hard battles. Like any strategist, I avoid battles I can’t win, but I haven’t felt my roster was lacking.
Just because people badmouth a character doesn’t mean you can’t do well with it. You don’t see a lot of 3* Captain America in PVP, but you wouldn’t want to have to deal with his 
at level 166. Most 3* characters can do you well at max level. Even She-Hulk. Even Beast. Even the old Daredevil.
As for the characters who are out of rotation right now? Their replacements are great. Mystique, Rocket and Groot, Gamora, and Blade will all prove to be strong contenders in time. As for Thor, the 


hitter with the high life total, try The Sentry. You’ll like him. Need Daken’s strike tiles? Blade does the job. Don’t have BP, but need someone who puts down strike tiles and then hits everyone at once? Gamora doesn’t have that stupid Defense Grid skill wasting a slot.
If you want Daken’s healing, it’s because you haven’t read how Groot’s works.
You won’t be able to collect all the 3* covers at once, anyways, and you’ll still need to get the ISO to max them. And I think you’ll find that a level 166 Mystique can do quite enough damage while you wait for the next 13 Thor covers.