For the moment, to me (and my guildies), the Arenas are a very big fail because of the queue system.
Why ?
On our server (Darth Nihilus), even with a strong and active PvP population, if we queue as a team (4 players), it's about waiting at the least 45 minutes before an arena pop, sometimes it even never pops. (and you can't go in warzones meanwhile, that would have been cool).
If you tag solo, it's about waiting 5 minutes. But I don't want to queue solo, I want to play with my guildies (not against them if they tag solo).
The 45 minutes queue seems normal to me. Why would people bother tagging 4v4 arenas and wait endless queues to get rated commendations when they can just queue 1v1 and get them very fast ?
So I can see only 2 solutions :
1 - allow people to queue with 2 or 3 guildies.
2 - Allow interserver 4v4 arenas queue, that should shorten the queues.
Is there a chance that it would happen ?
The situation is going to be even worse when the Galactic Starfighter expansion will come out, spliting even more the population between 3 queues.