And some players have thousands of hours in it? I´m seriously interested since it is basically just an arena horde mode. Where does the appeal in this game come from?

4 hours : just under 200 seconds

Absolutely no shred of disrespect intended, but when I saw the overwhelmingly positive reviews for this game and then actually bought it and played it, I mean... huh? Do I simply not get the fun factor here or is this a Bad Rats kind of a situation? This is an honest question. Help me out, what is it that I'm missing here....

Can anyone tell me?

Could somebody send an invite link? Thanks!