I've been playing it.
Yes it is a lot like halo 2 but guess what, that's what a first person shooter is. You run around with guns. The tweaks to the weapons (like you don't need a plasma pistol to kill people anymore) are more than enough... if you take a look around, you'll see they changed a lot of shit which requires you to have some totally new strategies. Everything also feels much more 'solid' in a way that really reminds me of halo 1.
I don't know what you guys were expecting, but after dual wielding there isn't a whole lot more they can do without making the game gimmicky. I'm glad they stuck to the old, relatively simple formula, because it works.
The items are cool too, though they will be much more fun in the campaign... and they have some more weapons and vehicles that we don't even know about yet.
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