Just because they have a signature campaign and there haven't been any scam accusations against them doesn't mean squat. Always remember the BitcoinBlackFriday.info scam - they had a very good appearance and most people were looking forward to them, including me.
That being said, Betcoin.AG seems to have a good reputation around the forum, and IIRC, they offer provably fair gambling. Always gamble with caution, though - never gamble in a new site with a tenth of your allotted gambling funds.
Yeah that is true, that blackfriday campaign signature was just sad to do, but oh well what can you do.
Further that is why if you start using bitcoin always watch what you are doing if is safe to gamble or not or safe to invest or not.