Definetly maps like Yaragar, Istiniar, Rizi weren't bad, but they had this tendency to be undefeatable - with a competent team, you could play them peasants to tincans, 3 times in a row (by losing on tincans each time, back then you played 4 runs per map) and then trying to succeed on the last try, which made it an ENORMOUS exp-farm.
I think now with almost twice the amount of rounds we had on DTVirgin, + more bots, that would no longer be a problem if maps were made harder and, let's say, we would have 3 tries per map to win.
Just don't re-add Yaragar, Istiniar and Rizi, those were nice maps but they were simply too easy, and their charm was ONLY being the exp-farms.