If the information is only ever listed for your own performance, and to you exclusively, then sure. If it's some sort of "majority rules", then I'm not as inclined.
Well, given that there are instances, however rare, of players being harassed, I'd rather not provide more tools to enable such harassment.
Plenty of folks have voiced that they do, in fact, care. Again, while rare, I have seen instances where players were, shall we say, "lectured" for improper builds or power usage. They may not have been outright kicked from groups, but there are some people that make no qualms about providing unsolicited advice...
As I said above, if such statistics are only for your own character and only visible to you, then I wouldn't have a problem with it. I do not think the game can actually track damage that was mitigated via a defense buff or such, though...