Personally I had a blast playing the Destiny Beta. I agree with some of the Gamespot concerns - most notably the repetition of environment use and that Devil Walker. Saying that, the Level 6 Strike was extremely satisfying in the most part. The combat is pretty special and although there's 3 instead of 4 in that strike team, it still felt like the right amount of players. It was a shame that when we got to the Devil Walker bit, we had to take potshots for about 10 minutes to take it down - although I ended up getting close enough to throw out a grenade and knock some damage off there.
Also love the Ghost Gun ability - activating that thing in the heat of battle felt very empowering, especially when you have those three thermal shots to play with. I also played the Beta on the PS3 (PS4 at work), and appreciated that Bungie did a great job with porting it across from the PS4 - environments still looked impressive and vast. Think the only issues with slowdown happened in the Tower, though might be a network thing.
All in all, I'm pretty much sold on the game. I have yet to get a PS4, though will definitely be picking up the Destiny bundle. It feels a lot like a modern PSO - even sounds a bit like it in the Tower too - oh, the music is incredible. Marty has left a strong legacy after been unceremoniously booted out of Bungie. I was super-obsessed with PSO on the Dreamcast and I'm getting the same kind of vibe with Destiny.
Glad I caught the Moon too :D