So, if I understand the crux of your argument, mmorpgs are ludicrous because they don't reflect accurately the life of a typical middle age soldier.
Let's run down that checklist
-Enslaved (serfdom) to your liege
-Likely to die/sustain long term damage from any wound sustained, no matter how minor
-Underequipped (only the liege`s knights get any armor at all
Gee, that sure sounds like the life I'd want to play in MY fantasy! Your arguments, while true, are completly irrelevant because nobody plays a fantasy game for realism. This is not a **** re-enactement of Ye Olde Dragone Slayinge.