Marvel rivals is painfully mid
For one, most of the characters just don't really feel too fun to play. Most of them either feel boring or just really underwhelming. There's only a select few characters which actually feel good to play imo (such as Iron fist and spiderman to name a few) which isn't good for a game with 33 characters.
For two, there's just a lack of innovation tbh. I get that it's a hero shooter and all but that doesn't mean it has to be exactly like Overwatch 2 just with marvel painted over it. The gameplay is near identical with the only difference being the pov. Garden Warfare 2 for example released at the same time as OW1 and can also be classified as a hero shooter and while you could easily compare it to Overwatch, it still had just so much content to set itself apart from Overwatch 1 at the time such as 2 different story modes, 2 entirely different wave based pve mode experiences (that weren't based on a holiday schedule) and highly customizable characters outside of the usual skins.
for three, the game just feels like very light shovelware. The game looks like a really high budget mobile game that was changed to be exclusive to consoles. The game itself just feels like a carbon copy of a previous game in its genre and overall, it just seems like a very clear cash grab that capitalizes on trends.
overall, if you agree and want an ow alternative that isn't Rivals, play garden warfare 2 instead. If you disagree with what I've said, that's completely fine, just don't be toxic about it 🤔