Destiny is a game that looks the part, but doesn't offer much in ways of gameplay. It combines elements of titles such as Borderlands, Halo, and MMO's....but it doesn't offer a deep loot and leveling system as seen in Borderlands (also isn't nearly as funny as Borderlands), a story you care about or competitive multiplayer as seen in Halo, or the deep MMO social features as seen in games like WoW or Guild Wars.
The game looks fantastic, and the music is very good. I like the art direction and design of the environments. The skies are beautiful, showing both the beauty of space and atmosphere. The terrain is also impressive to look at, though not as detailed as it could be on a high-end PC. The gunplay feels very solid and most of the weapons are a joy to use. If you are used to playing Halo over the years, you'll feel right at home getting used to the controls of Destiny.
Loot is given to you at a pretty slow pace which can lead to a lot of grinding in repetitive missions and environments. I can't tell you how tired I am of seeing enemies getting dropped off from dropships so that my Ghost can hack a shrine or system. The "planets" really are just new map/levels and really aren't as big as you hope they might be. There's definitely potential here to continue to add new planets but it won't be okay with gamers if you end up having to pay for them.
With that said, Destiny does do a good job of integrating the PVE and PVP modes. The PVE modes provide reptitive missions as stated before, but they can be a lot more fun when playing with friends. The fact that each server can only support about 10 players on one map (planet) pretty much nulls anyone trying to say this is an MMO. It really isn't and the game doesn't design the missions enough to encourage players to work together. The PVP is integrated with the PVE and introduced as another planet/area structure to travel to. You can access PVP(the Crucible) any time you are still doing missions. You'll get put in to matchmaking and there are several typical modes to play such as controlling bases/points or regular Team Deathmatch. These games can be unbalanced because each player is the level they are based on their progress in the campaign. With that said, there is some fun to be had and chaos to be created in these matches. Unfortunately, the map designs are just okay and it doesn't have the longevity of a Halo multiplayer. The biggest reason to play in The Crucible is to continue to level your character.
I think there's a lot to like here and there's potential(solid gameplay, pretty graphics, fun with friends, some loot/leveling), but in its current state, the missions are too repetitive to be a game you play for more than a few weeks. The story is almost non-existent, there are no real character interactions, the planets don't offer any reason to explore it(almost no lore) and are pretty much just desolate wastelands filled with aliens, and overall it's not a game-changing experience. We'll have to see in the coming months if Bungie can give gamers a reason to continue playing Destiny.