Kitty, Fado and I gave Warlords of Draenor a stab. I was pretty underwhelmed. The leveling processing to 100 was fun. And since I hadn't played since Wrath, I got to see some of the Cata and Pandaria stuff, which was cool. But once I hit max level, there was like nothing to do other than raid.
Their new PVP zone is pretty terribly-implemented. Long queue times. Faction grinding for a lot of stuff was straight up just kill grinding, and apparently the rewards were pretty disappointing. The storyline left a lot to be desired, since it's basically an alternate timeline, so it has zero impact on the overall story.
Garrisons started off really fun, and then they quickly became a chore. It's fun making a little fort area in which you are the commander. But having to maintain it required too much time.
I think the overall consensus is that aside from raiding, this expansion was considered a dud. But your results may vary. The trip from 90 to 100 was a lot of fun. Experiencing the zones and whatnot. But it didn't take us long to get bored of it.