Nexon is the publisher, not the developer. Not sure why they get such a bad rep. I've only played a couple of their games, and they weren't pay to win. What game have you played that was pay to win?
A lot of vindictus, some maple, some combat arms, some mabinogi, and tastes of some others. Some examples of my Nexon experiences:
-Buyable items that directly add stats or eliminate farming time (ex: torso cosmetic override for $36 that gives +att in a slot you can't fill otherwise, $5+ to buy unbinds to sell ANY high level item, 1000 AP packs for $20, whereas you earn about 20 AP per battle, $9 per enchant (needs 2 per weapon and armor piece), $4 per enhance (need 4+ per weapon / armor piece)).
-GM's / Forum mods that seem to be unaware of basic mechanics of the game
-Customer support is notoriously bad with ticket responses commonly being weeks later with robot responses.
-On a better note, the games they publish are typically really great and are the only reason people stick with Nexon.