With all due respect, Zel, the combat log and system information tells a lot about your character. From the food you are using, to the active boons you're providing, to the conditions afflicting you, and even what Rune/Sigil traits are triggering, etc. There's more than enough information freely being passed to your teammates by ArenaNet that it isn't overtly difficult to tell if you aren't performing - without even looking at ArcDPS. And if you constantly end up downed or dead, you're telegraphing plain as day that something is either seriously wrong with your gear, traits or skill as a player. ArcDPS only makes it marginally quicker to tell you aren't delivering if your role is DPS. People can figure it out without Arc, it just takes multiple wipes, and you'd still land on the kick list.