I would love a personal parser but I think people have to understand where the apprehension towards a party-wide meter is coming from. Since I usually performed high on the meters in the groups I ran with in other games I was rarely harassed but there was some harassment that occured. The big problem with the meters I think is that it turns killing a boss into a pissing contest between the DPS in a group. No longer is the objective to kill the boss, it's to do better than your own party members. A definite competition sets in for them in a way it doesn't for healers or tanks. If you are not a naturally competitive person this can feel stressful. If you are looked at as a number instead of a tank or a healer it feels dehumanizing. It can, and WILL, if introduced lead to bad behavior especially early on. I remember when we first got popular meter addons in WoW, people just acted like idiots. Rogues and feral druids would refuse to switch targets because they were bent on getting off a 5cp finisher so adds caused all sorts of issues. Additionally, people were jumping in too soon, bursting at the beginning of a fight, not cutting off dots before threat wipes (like Hydross)...all because they wanted to be at the top of the meter. Congratulations, we wiped but you certainly did rock those meters because you used your long, massive cooldowns early instead of saving them for an execution phase.

Meters can screw with class populations too. When everyone knows what dps class performs highest (because everyone will have the tools to figure it out) everyone will flock there. Not a huge problem, really, but some might find it annoying.

Actual damage meters will absolutely cause some deep changes in our little community. It's completely silly to say they won't. That said, they can still be used as a valuable tool especially for hardcore statics and they will not be abused as much as people think. They won't make jerks out of people who weren't jerks already. They WILL give said jerks a megaphone, though, so you'd have to brace yourselves for that.