Personally I hate the idea of having to pay for education. It's one of the few things I think should be fully state funded, along with heavy subsidies for transport but I digress.
But given we are unable to afford much nowadays and student loans now are fact, rather than theoretical. It's important to look at what a student WILL repay rather than the headline figure.
Noddy, since you quote MSE then you should also note that Martin says the following:
"In the April following graduation, it's confirmed that students from England and Wales will have to repay 9% of everything earned above £21,000 a year. So earn £22,000 and you'll repay £90 a year; earn £36,000 and it's £1,350 a year." source
So put it into monthly figures as that's how most people will get paid, £22k is £1450 net per month (approx) and a student will repay £7.50 a month. Should their take home pay rise to £2250 per month (£36k p.a.) then they will repay £112 per month.
The latter is obviously a lot more but then still easily affordable. I agree it is all but a graduate tax in name only but on balance given the alternative was increased taxes for all then I think it's probably the lesser of the two evils.