Most Appealing:Empire: I was always really into the Holy Roman Empire during history class, I love the outfits and I was enticed by the ability to be good (although not the best) in every field. That I can like the struggle of the common Imperial man to fight other armies, which are either stronger, faster, more numerous, etc but the Empire still prevails! (I could go on and on..)
Warriors of Chaos: I like to think of each one struggling to be the best, whether by combat, favor with the gods, etc. That I am a sucker for models with lots of armor and especially capes! (I try to even give my Empire characters capes if they don't have them - distinguishes them from the ordinary soldiers)
Bretonnia: I like the chivalry and knights aspect but I doubt I would play them unless they get a lot of stuff Empire doesn't have.
Orcs and Goblins: If I was get a third army it would probably be these guys, I like their randomness and the variety between the units you can field. Although I don't really care that much for Goblins though...
Vampire Counts: Honorable mention for these guys, pretty much only because they're undead Empire.
Least Appealing:Skaven: I may be biased after losing to them multiple times, but (my friend and Skaven player) always says how their engineered items is supposed to be the best (I highly beg to differ). I also just hate the idea of little rats scurrying around everywhere, when in practice besides the Grey Seer its all of the weird tricks and unique units that really overpower you in battle (Hell Pit Abomination, Warp Lighting Cannon, etc)
Lizardmen: (The same friend also plays this too and I've my share of losses
) I just find them to be bland. Yeah dinosaurs are cool and all, but I don't like the idea of mindless soldiers (they're made of from piles of goo in the jungle apparently) just meant to serve some fat guy in a chair who flies around and zaps people because they're blocking him from seeing his favorite reruns on TV. (Plus he could at least share some of those drinks he's obviously hiding in his chair's secret compartment!
) Although I do have to give a hand to them - the Carnosaur is cool.
Wood Elves: Yeah skirmishers in the forest is a cool idea, but I could never play them. I like a more organized force.