Got a few hours in last night. Just explore and the strike. It's quite fun but it does feel a bit like it doesn't know what it wants to be.
Explore:
It was really fun until you start to realize it follows typical MMO design in that the same enemies spawn in the same spot over and over and waaay to fast at that. The world felt really dead. No npc encounters, nothing really random, except of course the events but I got the same one twice in the same area so I'm not sure how random they really are. Also, I literally ran into only one other player while exploring.
The side missions were also all fairly repetitive but this is an early, low level area it seems, so I'll reserve judgement till when we can play other areas. My other gripe is there's not enough incentive to explore. I found no cool loot, materials (other than lots of spinmetal) or unique encounters. It's not quite the living, breathing world that it was billed to be. At least not at this point.
Strike:
Holy fucking shit did that spider tank take forever to take down. Of course nobody on my team knew what we were doing at first but even still each leg takes an ungodly amount of damage and the core doesn't stay vulnerable long. It was less tactical than it was a bit of a chore. Mainly due to the bullet sponge shielded guys who keep respawning, making it very hard to unload a super or heavy weapon from the right angle at the right time. I'm going to try it again tonight with some friends on VC and see if we can work better as a team. For a random grouping it was pretty brutal though. The last boss went down much quicker.
Mechanics:
Only one complaint: we have all these abilities to move quickly, jump, etc. but the accuracy penalty is massive. For the amount of quick movement I'd like to see that dialed back a bit. I'm thinking Bungie is trying to make it so lone wolfing is less viable.
I'm going to get into the crucible tonight and see how that goes. Despite what sounds like a lot of negativity above I am enjoying the game quite a bit so far.