I just don't have enough time to sit and play games consistently without having other things come up.
Diablo is easily my favorite game franchise of all time. Started playing the first one in high school and spent many sleepless nights in university playing the second.
I just don't know if I'll want to take what little time I have to game away from it for GW2 Already preordered GW2 though, so I'll see how it goes. I mostly just play BF3 MP, SC2 and work through Skyrim slowly right now.
Well I enjoyed Diablo too, but then came WC3, then DOTA, then GW.
I'm staying on MOBAS and GW2 for the time being, although I'll probably pick-up D3 at some point.
But that is the good thing of GW2 - you don't need consistent game play time.
For example an event started, you go there and start do stuff, your 2 old asks for the loo and you go. When you back you still get rewarded for your participation on the event (it has ranks of participation - bronze, silver and gold - based on how much you contributed). By the way, events are basically the equivalent to quests and not some raid or such.
Don't have much time to play and want to go to a certain area that is miles away of the town - bam, instant teleport to an explored way point on the vicinity - no time wasting travelling.
Max gear is easy to obtain and can be obtained by several ways, including karma (that you gain by simply doing events), crafted (and craft is fast since it the crafting speeds up if you have a big stack of stuff) or on dungeons, etc.
Personal story (basically campaign mode) - instanced and solo-able.
Receive rewards instantly upon completion - no going back to the other side of the world to collect the quest reward.
Want PvP - bam instant max level and gear.
Levelling is fast, but you still don't have much time? Well the first hour of play will give you loads of daily achievements well you do your general play to give you extra xp and loot; guilds can provide bonuses to XP and Karma; you can even buy xp boosters on the cash shop (+50% xp on kills for 1 hour).
GW2 is full of these examples of time savers.