It isn't a bad game. I would even say that your first few runs are pretty fun. After those first few runs though you've seen pretty much everything mechanically the game has to offer. The reason I only give it a 2 is because the game expects you to grind over and over to see the story. You do a 20-50 minute run and then get 6-10 lines of dialogue. Rinse and repeat. This just feels like artificial padding and the runs end up being horribly repetitive after too long. The handful of weapons are pretty unique but the boons you collect to modify them aren't. A minor status effect or buff like increased push range doesn't make this spear run feel that much different as another. I also have a complaint about the music. SuperGiant's previous three games all had amazing soundtracks that interwove well with their games. Hades' soundtrack gets lost behind the kind of unnecessary voice lines and the hectic din of combat. It isn't memorable and it just can't stand out from everything else going on.
In short it is a good 2-5 hour game that they bloat to a 40+ hour game for no real reason.
PS: I have a few special beefs with this game. The main one is that back during the development of Transistor the devs had said that they always wanted to move forward with their games. Each game a new experience. Hades contradicts that so much. The art is just Transistor but instead of a retrofuturism coat of paint it has a pseudo greco-roman coat. The game play is just Bastion but sped up. Several of the weapons are just the Bastion weapons with some tweaks while all the enemies in the first zone are reskins of enemies from Bastion except the one that is a reskin of an enemy from Transistor. My other beef is that the Greekness is as shallow as a kiddy pool. It is like they googled "Greek Mythology" and went with the first non Wikipedia link for all their knowledge. In game they occasionally acknowledge some of the more intricate or contradictory parts of Greek Mythology but then scoff at it and write it off. SuperGiant really should have just written their own universe like their last three games instead of haphazardly using a relatively well known mythology.