I have been playing it. Its really really good, most bad reviews I have been seeing for it, including Angery Joe, are pretty missleading. The game plays like Star Wars Republic Commando, in Warzone you can think of the game as HALO Battlefront.
The only compliants I have is that the very start of the game feels rushed, some of the game mechanics for guns, mostly Knight weapons, have been changed.
Everything else is amazing, the story, the game modes online, all the diffrent subtype of weapons you can get in the game as well as vehicles. It also happens to be the hardest HALO to date. People playing the game and complain that its easy are playing it on Easy or Normal mode not Heroic, Legendary, or Mythic.
Customization is above neutral for me, just about all the amour pieces are amazing, you get the parts randomly but at the same time if you compare it too other HALOs know you don't have to do crazy things to get armour, their some Commando armours all always wanted but couldn't get just because landgrab missions were not that populated and now that type of game is mixed in with other objective type games. I could still get it but by the time I do HALO 6 will be coming out.
JFYI the Spartan LASER is my favorite weapon and the most powerful vesion of it in this game is called "Selenes LANCE" or "Lance of Selene" which can mean Luna's Lance or Lance of Luna =p