5770 is about 200MHash.
You can put the #'s in to a calculator yourself:
http://www.bitcoinx.com/profit/I show that you'd be getting around 0.03 bitcoins per 24h (three-hundreths of a bitcoin). Pretty far cry from 2.000 bitcoins per 24hr.
He said he was getting 1 coin every 2 days, not 2 coins every 1 day.
That doesn't make his point irrelevant. 0.03 BTC/day isn't anything near 0.5 BTC/day.
It's only viable at this point if you're mining at a profit from cheap or free electricity, are mining as an investment, or have some other motive. ASICs have cropped up (at long last), and the network hashrate is rising pretty quickly.