Before you go all "whoop-di-dooo" on your own arena rating, consider the facts. Different arena comps require different skill levels. Some comps can be played fairly well by blindly nuking, other comps require CC training, cooperation and timing, etc, etc.
-Does he play an OP comp?
-Is his class flavour of the month or OP? (e.g. hpally/dpriest are well represented in 2v2 above 2.2k, while there is no MW monks)
-Is the rating in 2v2 or 3v3/5v5 or RBG? (2.4k in 2v2 ~= 2.6k in 3v3/5v5 ~= 2.9k++ in RBG)
Most popular comps: http://www.worldofwargraphs.com/stat...0-0-0-0-0.html
Class distribution: http://www.worldofwargraphs.com/stat...0-0-0-0-0.html
Stat distribution for hpally: http://www.worldofwargraphs.com/stat...0-0-0-0-0.html
I included hpally stat distribution to show how the gear seems to get worse the higher rating people have. In other words, people get their rating up super early in the season when there is less geared competition. In season 13, these people would most likely have ilvl491++ already making it hard for players new to the scene to get any significant rating with ilvl476 gear.
When it comes to class distribution you can look at the global representation vs the 2.2k rating representation to determine if its overpowered or not. Sub rogues in RBGs have a 6% representation, while on a global level they are only represented by 1.9% of the community..which equals overpowered in RBG. Disc priests have a global representation of 3.1%, while in 2v2 above 2.2k rating they are represented by 19.4%..which equals massivly overpowered in 2v2.
Shadow priest is the most OP class/spec in both 2v2 and 3v3, the famous Reckful plays a priest these days, just saying. He also plays rogue a lot, which is the 2nd most OP class/spec in 3v3. rogue, spriest and rshammy is the most represented(read: easiest comp to get high rating with), and Reckful plays this comp these days. Skill, "fotm" or both? You decide. To get at the very top of your preferred aspect of wow, you need to take race/class/spec/comp into consideration AND you need skill to beat all the other teams with the same comp.
At what rating do I consider myself better than other players? Short answer: I dont. I play the class/spec I enjoy the most, even if it means I am underpowered in the current patch.
Long answer: E.g. a mistweaver with 2.0k in 2v2 is currently miles ahead of a disc at the same rating. Rating means nothing unless you consider the bracket+class+spec+comp+(global vs top representation). Rating is just a random number when excluding all factors.