It's all situational, to be honest. I had a WAR (myself as AST) in one of the end game dungeons last night. He pulled two packs, then proceeded to run off and grab the dogs as well. Needless to say, we melted. No communication happened, but we adjusted accordingly.

OTOH, it's rewarding to pull hard as a tank if you know your party can handle it. It's also frustrating when party members run off and pull things to you, or huff and puff at your "slowness." Everybody does it, but I think DPS are especially guilty of this.

I know a lot of BLM -- and myself, as a SMN -- who will start boss fights or early engage a pack in order to keep Enochian/spend Ruin IV procs.

Gonna echo a point made earlier in the thread where communication is key. I feel like the tank and healer should have more of a say than DPS how the dungeon flows, but it's a game. Adjusting to early pulls, over-pulls, and losing your procs doesn't mean you're letting your playtime get ruined.