Cata soup was tasty and filling, MoP soup was bland and to get satisfied you had to eat a shit-tonne of salad at the same time.
WoD I find has some of the best variety of salad but it's limited in portions (although Tanaan has upped the number of portions you can have. The soup is about the same as MoP's (and at least it isn't watery and flavourless like WotLK's) but you don't have to get it with salad and the cheap steak rounds it off nicely. WoD also gives a nice selection of nibbles.