Well, yes. If you have terrible ping, you won't be able to aim at a moving target, only in the "general location" of a moving target. Personally, I think RT is great, but then again, I have 150 ping, not 250. If I had 250, I probably wouldn't be able to hit moving targets too!
Perhaps one solution would be to have a server setting of "fatness" for the RT hitboxes? Like 125% fatness makes the RT hit detection zones 25% bigger than normal to compenstate for laggers.
Then again, I'm using a 9 shot, slow firing pistol and I can hit people. Why can't other people hit with a 30 round, full automatic, armor penetrating rifle? In my opinion, RT is not perfect, but it makes the game much more exciting than vanilla. You have to actually aim instead of spraying in a 4x6 foot area.