For the record: Right now, I'm running two God-killing decks. One is the mono fire splash light that wins by CHARGING MAH LAZORZ and throwing 6 fire lances to the face, and the other is a rainbow.
That stated: it is starting to get boring. That's what happened with Kongai. I unlocked everything, and now new content is being added.
As for games without grind:
Any game not based off of loot or levels.
This is actually the vast majority of them.
Shmups, RTSs, the best JRPGs (read: Final Fantasies on story playthroughs), any Megaman or Legend of Zelda games, and so on.
The games that do have grind:
Diablo series
WoW
Any micro-transaction MMO (which is free to play until you're addicted at which point you start paying money to make the grind go faster or some s***...you shouldn't walk, but RUN from these)