Nothing I can really consider grinding, no, not fun at all. Now, do you just consider playing multiplayer games grinding? I don't play them with the mind set of "I need to level up to get the next thingy!", I play them because they're challenging, testing my skills against those of others, and that's what I consider fun.
The way I see it, grinding is a mentality. Are you doing something repeatedly for the sole purpose of completing some objective, whether it be leveling up, advancing in rank or just unlocking something? Congrats, you're grinding. Doing something for the sake of doing it? Hey! Not grinding.