You've walked away from it before when interest waned. A one month sub costs $15. Less then a trip to the movie theater. Give it a go, and if your interests aren't peaked....walk away again.
No problem with people who have different opinions or thoughts, but when you needlessly feel a need to turn people away from something when they may actually like something you don't, and not give them a chance to experience it, I have a problem with it.
I would recommend getting one month subscription if you don't feel like playing on a trial account for few days. You are not going to get much objective feedback here to be honest. The best way is to play it yourself preferably on your own characters of higher level and make your own decision. You don't need to buy expansions to get a feel of all the changes such as new talent systems and stat changes. After that you will be able to make a call to wether buy expansions or move on. Another suggestion would be watching some of the "class changes for 4.0, 5.0" etc on the youtube to get a better understanding of the changes that happened over the 2,5 years you were away.
There is a difference between constructive criticism of World of Warcraft in an effort to help someone decide and just game bashing. Saying "WoW is trash" or "the game is crap" is not even close to it.