Mark me down for some level of spell/ability limitation. I like the idea of having a set of spells for different situation. To not only plan for what might go down, but plan according to what you'd be fighting and who with. That shaman can slow, so your enchanter can load some other situation spell (or slow, just in case, depending on the situation).
Also, Vanguard had a lot of elements of timing that I liked. Even when combat was spammy, you had to pay attention to when you were casting what. With reactions and counters and intercepts and vulnerabilities, it wasn't just spam your rotation and it not mattering what you were fighting. You had to pay attention.
The problem was it was sometimes too fast, the paying attention didn't really net critical results, or the 'sometimes' abilities just became 'all the time anyhow' abilities, like the group life-tap heal on my blood mage that was triggered by crits on a character running like 45% crit rate that was almost exclusively spamming abilities that could crit. Sure, it was awesome, especially in raids, having a HUGE group heal pretty much always available, but it got to the point I had to take it out of my spell macros because my best heal was firing off too often and I couldn't get any dots or DDs down. That's a backwards problem to have on a damage-based healer and made what started out as a life-saver sometimes spell pretty mundane.
I'm all for spell fizzles, spell misses, resists, weapon types, damage types, mob vulnerabilities and limiting active spells/abilities and all that kind of thing. It makes you have to be ready to react and capable of it.
Planning for encounters, paying attention to circumstances, and then using your chosen tools to best handle the situation sounds awesome to me, and like something I haven't experienced in many modern mmos.
