IMO there are a lot of "problems" holding me back to nerd WoW retail again.
Yes I bought ALL addons so far and I played them.
Here my summary:
Vanilla:
Oh lol, what's this game in the beginning? No clue at all!
End up nerding it every day for about 7 hours.
Played a lot. Was in a good raid, did a lot of pvp (rank 10 and 11 with 2 characters)
We knew each other on the server! The premade BG groups (ally and horde) knew each others TS, chilled together, fought against each other, had a lot of fun raiding each other Cities.
Farmed rep to be able to ride other races mounts and some other shit.
TBC:
Was really hard and much stuff to grind. Like farming revered to be able to enter HC-dungeons.
Loot was nice, professions were nice too (like Weaponsmith for Warriors!)
Raids were realllllllly coooool!
Played a lot or arena though and got 310% gladiator mouns, which I couldn't use because NO MONEY

Then did a lot of farming to be able to fly with my babies.
Really cool addon and played it a lot.
Vanilla was cooler tho! --> Again: >>We knew each other on the server! The premade BG groups (ally and horde) knew each others TS, chilled together, fought against each other, had a lot of fun raiding each other Cities.<<
Wotlk:
Was cool at the beginning. HEROIC class DK!
Leveld it instantly, another gladiator title, very good progress raid (top 100 world), played a lot (5 raids + 2 gladiators --> A lot of fkn time)
Got anything, game became easier! Much easier!
Then the first hard modes came in Ulduar after clearing the "normal-25" mode in the first days!
Then the game began to suck for me personally.
Same shit, different package of the product (normal vs hardmode) was not enough for me.
First big break --> came back to Trials --> Dissapointed but farmed it because of ICC.
ICC! Cool raid! Very very nice

--> Again same shit in another packge because of 25man, 10man, normal, hard..
Cata:
Played 1 month arena, again good rating --> raids sucked for me.
Quit WoW til DS-Raid --> Raided, cleared it, did a few heroic bosses (6-7 as I remember). Quit again til MoP.
Shit-Addon.
MoP:
Played 1 month arena and RBG, again good ratings --> raids sucked for me.
Quit WoW til ToT-Raid --> Came back because of friends, raided then ToT and then SoO heroic.
Cleared it, quit WoW --> Came back before WoD and cleared it again on the new myth difficulty.
Shit at the beginning, was nice because of old Vanilla-Friends.
WoD:
Just played PvE here. PvP = Every class was about the same, just different colored gear Oo
Everyone could stun, fear, dispell, purge, break cc, and so on. It was just, who nukes better, who got the better lineup. Fk that.
PvE in the beginning very nice. Garrisson sucked so hard that nothing happend ingame except the raids (top1000 raid world, casual cause of work and wife, no student anymore

--> Only 2 raids / week)
So i basically played ~8 hours a week --> 2 Raids a 3 hours and 2 hours a week for garrisson and stuff.
Quit again with WoW because it sucks!
Tried raiding again in the summer because of my friends, cleared the new raid on HC (myth 5-6 bosses) and stopepd playing again, because I dont see the point here?
Just raid 2 times / week, and do nothing else because of the fkn garrisson.
Dont get me wrong, I didn't have even to pay for WoW anymore because of this new token (about 50k gold for one month of play) because I made about 100k gold a month WITHOUT playing due garrisson! (In the beginning I played a lot, had 4 lvl100 chars and "finished" garrissons on each of em)
Then I tried some BGs/Arena. Both sucked really hard IMO. Ashran-PvP was shit at its finest lol.
Quit again, never wanted to play WoW again.
Friend of mine (from Vanilla back then) contacted me, told me about Nost --> Started playing here.
Im "addicted" to WoW again because of the Vanilla flair

Doing BGs, laughing because of them, dungeons are wipe-feasts with bad gear and even bad people. Really funny IMO ^^
And I know for sure, IF I start with Legion it will end up pretty the same like WoD:
In the beginning its nice because its new --> Your farm gear, you level up your profs and so on.
Then you begin with the raid, clear it on normal/hc and then it begins to suck.
So I won't play it (cant say for sure, because If all of my friends begin, I would have at least to try it ^^)