Like I said, merceneries give you a choice you wouldn't have if they didn't exist, not to mention they add dynamics and depth to the game. If you don't like them, don't get one, simple as that. It's not like Diablo has WOW-type DPS mods/charts that people are going to keep track of how much DPS you and your merc are doing.......... OMG, he doesn't have a merc !, kick him from the party ! LOL
But you would have a point with PvP. If you don't want a merc it could make a difference, and that's why I asked about PvP.
We are clear that we dont want mercs inside arenas, thats nice, if some1 still wasnt them inside arenas, let you know that it wouldnt be an "arena", it would be a small team wars
appart from that, as you know, characters have pets (including Ye olde arreat dudes of the barbarian) which under my point of view, paired with mercs will have a huge advantage over the rest, appart from that, whats the point of people following you through quests? they say quest givers will go after you, for example the very start, where you dont speak with a guy for about 1:30 minutes, but instead greet one another and go on, the fact is, you will end up with 20210839034 people around, which means 1fps or quantic PC, now tell me 1 pro of having a merc, appart of the extra free dmg and the additional playability they give, which is the same as pets and their talents