I support them, mainly because I was one. Now I'm a couple years in with a CCRN to my name, and feel that going right to critical care was the absolute best choice for me. We hire a few new grads every year, and I find that the new grads (again, the ones who are really motivated), move right up the ranks in the unit. They tend to have to work a little harder up front, but struggle a lot less than some of the nurses who worked med-surg prior to moving up.
In terms of the comment that most ICU new grads state they couldn't handle a med-surg assignment, I actually agree, at least initially. The reason I say that is because as an ICU nurse I micromanage every aspect of my patient's day. Want to get up to the chair? Pee/Poop? Eat? Drink? You better believe I will be right there next to you while you're doing any/all of that and measuring your I+Os, ambulating you, etc. It absolutely freaks me out when I walk through the med-surg floors to see patients out of their rooms and walking around independently. lol. I know that my time management would be impacted because I would be managing my patients like I manage my ICU patients, and I know there isn't time for that with a 7 patient assignment. But in time I would adapt to the flow of the unit. That said, I have floated to PCU, and have dealt with a 4 patient assignment without too much trouble.