To all the people who say it's to early to to review or judge an MMO by the second week is absurd. If it was any other game a couple hours would be more then enough to judge a game if it was good, fun enjoyable to YOU. MMO's are no different, lets speak to MOP specifically though The first week we had access to everything except the new PvP season and Raiding. Just 2 aspects, big features in this game yes, but to withhold judgement based on two aspects is just as absurd as calling people out for judging the expansion before all content is released for it. Most people in this game don't even touch raiding or pvp (hard to believe but those are the facts) MoP has brought a load of things to do outside of those areas, I'd say 2 weeks is more then enough time to give an accurate judgment. Lets be honest here it's all subjective anyhow, people have been judging the game with out even playing it...."Pandas are dumb", "Pokemon is dumb", "this game is for casualkids now" etc.
Or we can take this mindset when you say it's to early to judge, well then you can't judge WoW at all then can you? I mean the game is always getting more expansions, more patches, always being tweaked. Since there is no end to the game you can't clearly judge the game right? Since you obviously have not YET had the opportunity to try out all the new Raids, Bg's, Arenas, Dungeons etc.
TLDR: Judge it for yourself, move on, don't put some absurd timetable on how long you judge a Game.