I really enjoyed the experiences I had in the Vault of Glass and Crota's End (normal mode). It was one of the main reasons I played the game, and it was a way for my great GAF friends to enjoy ourselves for an hour or two, so it's no surprise that I'm pretty damn disappointed that there's no raid in the House of Wolves.
I'm struggling to picture how the arena will impress me, as I haven't been too impressed with Bungie's decisions ever since the launch of the game. I'd love to
reserve judgement, but judging by Destiny's upgrades and content in the past it's soooo hard for me to.
Limiting the arena to three players is unfortunate as well. The expansions have very little content as it is, so anything that promotes replay value is welcomed but I just have a hard time picturing what it will do. Realistically I envision a long strike, maybe with some light raid-like mechanics sprinkled in and random modifiers, just don't make me press square to deploy the ghost! That's just not enough to hold my interest, personally. If that's what it turns out to be, I would have preferred a raid. I can totally understand wanting to delay the raid if it's going to be another Crota's End though, the experience just wasn't up to par with VoG.
I really, really enjoyed the raids in this damn game with friends and news like this makes it all more disappointing to me. Here's to the arena, I guess...