Played Bulgarians mostly. Love the cheap Krepost but when getting sieged they drop like flies. My own fault for not having enough meat in front of it I guess.
Been douched by the Cumans a couple of times, but I just add more onto stone, buy my way to Castle Age and drop a castle on the bastards.
Lithuanians I hunt for relics early for the Cav bonus, but always struggle with food. Just the way I play the game I guess. Very wood/gold focused.
Still haven't played as Tatar. Should be next on my list!