I think most people simply dislike Spell Speed because it's very difficult to get respectable amounts of it during the first gear tier (so to speak) we're stuck in for the moment, and the general opinion seems to be that people either want halved (re)cast times or nothing (which is kind of absurd, in my opinion).

For all we know, by the time a new expansion is imminent, it could be possible to get enough spell speed to halve our cast timers, or enough critical hit rating so we cause crits half the time. Or maybe enough Determination so a simple Physick/Cure restores half the health of a DPS? So, unless Yoshi-P does a 180 degree turn and "caps" item levels at 90 and switches over to horizontal gear progression, I'd say we should give it some time.