It's also pretty much impossible to win DTV without glitching the bots/shield walling.
Not true.
I've spent a great deal of time playing DTV be it pre-patch or post-patch, and it
was impossible to survive
Defend the Tower/Ruin/Hill without camping of some sort.
When DTVirgin came out, which was a great update (Drastically reduced the amount of leeches and farmers, plus the re-purposed gamemode finally has lived up to its name in a comical way), I've made it to Engineers, Sexies, or Tincans more times than I did in pre-patch DTV without camping/glitching anything (other than having few players camping at the virgin to ensure her safety)
DTV has improved much, be it the gameplay, system, or the minor details that are hardly noticeable, it is a great gamemode that I enjoy even more than before.