I'm playing through the single player game right now. It's pretty decent! The loot system feels pointless; you only upgrade so fights don't get any harder than they already are; I've not felt like I'm actually IMPROVING at any point, just holding the status quo. Upgrade-point purchased attacks don't appear to do more damage than others, they're just additional animations. The story's been decently fun so far, though, and Kamala Khan in this is WAY better than the kinda whiny one in the D+ series.
For the $4 GMG is asking for it, it's a good deal. The multiplayer can be fun for a bit (we played that first, mistakenly thinking the game's campaign was multiplayer, somehow), but it does feel very same-y, even after only doing a couple of missions. Go here, beat up doods, go there, beat up doods. Sometimes you have to have at least one person inside of a zone while beating up doods to progress.
This and GotG both have the same problem: the characters look like dollar store knock offs of the "real" ones. Sure, you can say the comics came first, but whose faces/voices do you think 99% of the world associates with those characters? Lack of actor likeness is going to hurt the sales of these games every time, even IF the game is good, and not by a small amount. This game's MTX bullshit definitely ALSO was a problem, but the cover art just reminds me of those Kung-Fu Panda rip-off movies on netflix.