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Here we go, this is my opinion, but...
warrior plays like a warrior
stalker plays like a rogue
engineer plays like a hunter with heavy armor and so they are way less mobile
medic plays like a paladin, but withouth the heavy armor and defense, which they traded for the mobillity of the hunter
esper plays like a necromancer
spellslinger plays like the good old wizzard/mage/sorcerer.
basically thats it.... True, there is a lot of diversity, but based on playstyles this should tell people which class to choose..
Best MMO experiences : EQ(PvE), DAoC(PvP), WoW(total package) LOTRO (worldfeel) GW2 (Artstyle and animations and worlddesign) SWTOR (Story immersion) TSW (story) ESO (character advancement)