You only really have a right to complain about pulls if:

1. You observed the party can take bigger pulls and already asked in chat. YES, even in dungeons YOU overgear. Honestly, it won't hurt to type a simple "We can pull more." Ask first, don't be a dick and just pull.
2. You're the tank, and someone keeps running off and pulling without saying anything.

Other roles have queue times and you don't because they wait for YOU(tanks). The same is true for dungeons. Setting the proper pace for dungeon runs is a tank's privilege AND responsibility. If someone points out the party can go faster then you should pick up the pace.