It is a Borderlands-esque loot hunting game. It's a Warframe upgrade your armor/weapons and explore our Solar System game. It's a Mass Effect campaign where you change the universe with the decisions you make. It's a Halo-esque multiplayer game where super soldiers with amazing abilities fight each other.
It is a good game. All of the previously listed games are great games, and I think a game created with all of these parts will be just as great. Destiny is an original idea created from previously thought of concepts.