Day one opinions so far?

Note: I have MoP loaded, but haven’t played it yet. Circumstances (best left alone) have kept me from experiencing it until I get home from work this evening. I didn’t start playing until about a month after Cata was already released so this is my first experience with a new x-pac.

I must say, however, that I’m amused (and a little confused) with the variety of responses and commentary here on the forums. I have a 2-part question to pose. For those with a greater ‘hindsight’ perspective (at least one other xpac release under your belts), whether you like what you’re seeing so far or not (doesn’t matter), what do you feel is the single best/worst thing you’ve experienced so far and other than that one thing, what is the something you would seriously recommend others make an real effort to experience/avoid.

Please keep responses limited and rational (i.e. no profanity or extended rants), we’re just trying to get the facts of personal perspective/opinion on the table, not dissect and analyze them. Ty.