As someone that told you to try MP:H, I think your review is very fair.
My view of the game is of course colored through the lens of nostalgia but I do remember it getting quite repetitive in terms of enemy encounters. So while the variety might not be quite there, the moment to moment gameplay was still phenomenally well executed.
It’s a cracked version of the game that has been heavily compressed to reduce download size. This is why the installer will eat a lot of CPU resources during installation. While you probably won’t be banned, I would generally avoid playing these games through steam as a precaution. Usually multiplayer doesn’t work normally anyways.