I'd say that 99%of dice sites here that are completely unlicensed are better than all the licences casinos out there by a large margin. Except for bitdice.
Most of the dice sites are legit and their operators are the most trusted people in the bitcoin community in some cases because they are able to handle hundreds of thousands of dollars or even bitcoin without any intention to scam.
Try bitdice, Bitsler and Primedice. These are the three dice sites I use and find trustworthy.
Yep, dice sites and gambling with Bitcoin in general is fairly secure, as is investing in their bankrolls etc. Unfortunately though how trustworthy they are can't be verified except by other members of the community, so they could collapse at any time.