We have been through this before with other members, and so have i, i tried and searched for 2.5D games and came with an unfortunate conclusion . 2.5D games is a perishing industry most of the 2.5D games are either dead or dying ..... why would companies make obsolete 2.5D games which wont attract many customers when they can make a good looking fresh 3D game? they wont , however i can recommend some cool MMO games that u might like
1)

DC Universe Online is super hero genre MMO based on DC characters ( batman superman joker lex luthor etc ) which is kinda cool, u get to build ur own superhero/supervillan , it has a cool story line ( i personally like it ) and it has good PVP i'd say , so if u like this superhero thingy and want some cool PVP ( itsnt a pvp-oriented game like co tho ) then u might want to try this one out
2)

Aion 3.0 , its an online game based in a fantasy world called arteria or something like that, now this one is probably the best MMO out there in terms of graphics ( i personally really like the graphics of this game ), the story line isnt so bad either , however lvling isn't so fast in this game ( wasnt for me at least ) , i think it has good PVP, its Close to WOW in many aspects , so if u like good graphics and want something that has relatively good pvp and close to WOW then aion might be ur thing
3)

now this game doesnt have shiny graphics like aion,however its probably the only Horror based MMO game out there , it has a dark theme, all monsters are scary creatures, theirs alot of blood there , PVP is kind of balanced, so if u want to try out a whole different type of MMO like nothing u tried out before in terms of style ( the horror based style ) then perhaps u might want to try this one out
( Note : all the MMOs ive mentioned are free to play )