Arguments are healthy as long as they are not toxic. An argument by the definition of the word is not a negative type of conversation, unless turned into one. Just like the word critic doesn’t mean something negative. Because a critic can be both positive and negative, or mixed, etc. 
So, you are free to argue here.
As for ARPG game, or Action Role Playing Game game - ARPG is a name of a game type, so, I like to add that “extra” game at the end of the genre name.
You won’t find anywhere genre name ARP game, but an ARPG game.