The game definitely took some inspiration from the MCU, but it certainly doesn't look exactly like it, well, except for Banner's wardrobe. I think the 3 Avengers that are clearly MCU inspired are Banner, Ironman and Black Widow. Though I'm uncertain about Widow, I mean how different can you make a black body suit look?
Banner is a blatant rip off of Mark Ruffalo's Banner in the first Avengers Movie, but without his likeness. Ironman's armor has a striking resemblance to the Mark XLIII armor from Age of Ultron, but slightly altered to look different, and somehow worse.
The only two that look completely different from their MCU counterparts are Cap and Thor. Cap's entire outfit is unfortunately too bulky and busy, and Thor... honestly I have no idea what the hell they did to Thor, or what blind person approved his design. Thor looks like a 3D stock model, the costume doesn't mesh with the rest of the Avengers at all, and he's got dinner plates stuck to his chest.
The whole problem is that they didn't distance themselves enough from the MCU. They want to do their own thing, yet still take inspiration from the MCU, but make their designs look different enough, so it's not a 1:1 copy of the MCU. As a result, most of the designs look off, because you can clearly tell what was inspired by the MCU, but the game is not supposed to be the MCU.