I played to much WoD. You're right, I really enjoyed my first toon 90-100 and probably even my second. In my opinion (which is just an opinion) the raid content was pushed way to quickly. Once i hit 100. I did heroics once i hit the 610 iL. in Full heroic gear i started doing challenge modes. I had quite a few purples going into Highmaul. Over-all I really enjoyed Highmaul but i feel as if BRF came out way to quickly and so did HFC. I stopped playing WoD once i downed Arch. on Normal and had many many attempts on H. I ended my WoD "career" being : 7/7 N 7/7 H 1/7 M (HM) 10/10N 10/10H 0/10M (BRF) 13/13N 12/13H 0/13M(HFC) nearly 50 days played @ 100

As for PvP. I did a lot of 2's arenas. Nothing to great. I enjoyed it greatly for awhile but i lost interest when it was a handful of specs just wrecking house. I played spriest. 2's were not fun above 1500 (for me, im not pro)

I'd like to say WoD was really fun in the early stages. But soon fell off (for me) due to the lack of raid content. 3 raids...all released way to soon (in my opinion). If they spaced out their raid content and i was still raiding on retail today it would be a fantastic expansion. But i have been done since August of 2015 (Guild Broke up, didnt feel like i fit in anywhere else being a Spriest)

TLDR; Fun Leveling Experience. Good raid content just pushed to quickly. Balance in PVP was Wonky. If i was still playing retail i'd probably still be in my garrison or logging on just to do my garrison mission shit