Any coin that can be mined by CPU is a bad idea, as it's network can be dominated by a massive botnet.
On case of Magicoin hashrate is limited to 250 Kh/s by user but you can to get a thing beetwen 6 or 10 coins for day only.
That doesn't stop a botnet in any form, it just makes the creator make each infected pc mine on a new user that sends the funds to the main person.