I'm for it, but I totally understand the people who are against it. The majority of people have grown up playing jRPGs and MMOs where you grind to get by. Hell, I'd be lying if I said it was therapeutic sometimes to just walk around, murdering and growing stronger.
If you've ever played Dungeons and Dragons and the like, while you do get exp from murders, the majority of exp rewards are for completing objectives with bonuses given based on HOW you complete said objective.