I agree and like that PrimeDice has a user friendly design. It's definitely one of the best bitcoin dice sites out there. It would be really awesome if they added LTC, ETH, or DOGE.
I'd like to see PrimeDice add support for other currencies as well, but I guess for now we have 999dice.
I don't think its fair to mention a scam dice site along with primedice. If you are looking for a dice site that supports altcoins, there are lots of them out there, i think its only primedice who are left behind not using altcoins