Originally Posted by
Stabbyfists
Honestly - I only played Classic to experience the content I never had a chance to do growing up. Namely the 40 man raids. I also plan to do TBC Classic as I never had a chance to experience TBC Raiding as well. After that I would probably stop playing Classic as I started in Wrath, and I cleared everything on Hard Mode / Heroic back then. Same with Cataclysm, Mists of Pandaria, and Warlords of Draenor.
Classic and TBC are really the only servers I can see Justifying their existence - Because they contain content you can no longer play on Retail servers. The list of content removed or altered in Retail is extensive.
01. Naxxramas 40 Man
02. Onyxia's Lair 40 Man
03. Deadmines
04. Shadowfang Keep
05. Stormwind Stockades
06. Temple of Atal'hakkar
07. Stratholme
08. Zul'Gurub 20 man
09. Zul'Aman 10 Man
10. Ragefire Chasm
11. Scarlet Monastery Graveyard
12. Scarlet Monastery Cathedral
13, Scarlet Monastery Library
14. Scarlet Monastery Armory
15. Scholomance
16. Blackfathom Deeps
17. Razorfen Kraul
18. Razorfen Downs
19. Upper Blackrock Spire
These instances were either removed or altered in such a way they are almost completely different instances. Classic servers not only allow you to experience the old world before Cataclysm but also experience these instances as well. Also the Story of World of Warcraft was altered on Azeroth after Deathwing arrived so newer players might be able to go to Classic and Experience the storylines from that game as well.
So while I think Classic PAST TBC is not really needed as content was not really altered or changed until Wrath of the Lich King, I would not call them a failure in the slightest.