With Warframe, the grind is very there but it’s not the point. The point of Warframe is to learn how to slide and float around the level like an anime protagonist with everything falling to ribbons or exploding into gory mist around you, and to look good doing it. The unlocks and currency and quests all serve to open up different places and ways to do that. I saw someone saying the story is great; I dunno, it didn’t make a lot of sense to me, but that just means you can ignore it if you want. I put in over 800 hours because that bulletjump traversal feels so damn good (and I hate grind, WoW made that happen years ago). My wife has over 1000 hours; we didn’t have a clan, we only played together.

That’s a lot of hours, for free.