I have read so many posts where people wish to see different Factions with totally different Classes for replayability and the lore. This must sound so romantic and great for roleplay to players.
And yet- it all falls down when it hits the players hands. Recall, Static Class based games suffer from huge envy problems. Trust that players will analyze the math in the background and compute the mathematical differences between Factions.
For most any mmorpg with unbalanced factions you'll hear how unbalanced the PVP is. I kid you not- this is the ONLY genre that has unbalanced factions. Blizzard best decision ever was to share the Classes for PVP. Of course the pvpers still whine about the maps being asymetrical... Funny how pvpers complain about every little imbalance?
Think about fighting games like Street Fighter. At anytime I can switch between Ken and Ryu. I am not stuck playing Ryu cause all my friends choose his faction. No, I can switch anytime and optimize. Sure, maybe all the fighters are viable in their own way but if its not then trust me I can choose the best 'Class' (aka Fighter)
Take RTS games like Starcraft, Warcraft 3, Supreme Commander- take your pick. If I suck with a Race I can SWITCH anytime.
Every other genre PVPers can optimize their team compositions by picking from the best. There will always be a superior build, a superior power, a Flavor of the Month, etc. I dont care there is always balance issues unless everything is exact same (symmetrical pvp). Only way to self-balance this is to allow pvpers to choose the most optimal builds.
This is why many of us love Free-For-All PVP or at least games where I can ally/unally with any faction I choose or what Blizzard has done- make all Factions pretty much equal. Any 3 works for me....
Anyway it always warms my belly to see so many mmorpg pvpers being hell bent on having totally different factions and how much choices they have. Then after they get into the MMO they want to scream how unbalanced the factions are.
On one hand asyemetry can be good. If I win a fight against all odds then that will give my avatar major bragging rights. But ultimately, these imbalances can kill PVP because the 'other' faction has the most viable choices for PVP. Eventually we might see what I want to forever term as the 'City of Heroes Syndrome' whereas most pvper rolls on the 'blue' side so that they can have the most viable avatar for PVP. Now the 'red' side is totally outnumbered in the PVP zones. Ouch!