I have been a long time fan of the Halo games, and have played every one, minus ODST. I was very excited that there would be a new race of alien to combat, as I, like most, were kinda bored with the usual bogeys. It didn't take long to realize that this was going to be very much the same game as all the others, but with upgraded graphics and effects (which I loved), and an extremely sappy romance (which seemed to have been written by someone who has never actually had a romance).
There were some good parts in a couple of the missions, mostly while outside, as the inside scenarios reminded me of every Halo prior to this one, and why shouldn't they, the architecture is of the same manufacturer, but I felt like there was way too much inside combat and not enough fresh air.
The new enemies were nothing to write home about, and their weapons just pretty much paralleled the weapons already in place, but of a different make. Not much creativity involved.
The real kicker, and the thing that wanted me to write the most disgusting review ever, was the way that it ended, and the (SPOILER ALERT) lack of actually getting to fight a main enemy. Instead, there is a semi-cinematic scene that tells you to press 2 buttons at specific times.
The multi-player is awesome and a ton of fun, but this will most likely be the last story mode I waste my time on.
Real interesting. Great graphics, weapons, vehicles, plot, and characters. The backstory behind the forerunners was significantly elaborated upon and the Cortana plot was spot on.
Complaints are lack of single-player location variety, most are indoors in forerunner/promethean facilities/ships. They could have shown us more about Requiem. Halo Wars was also set on a forerunner shield world and they did a better job of showing different landscapes and settings. A couple locations that aren't are in a UNSC ship and a UNSC space station. I do know some of the beginning was outdoors and the whole mammoth thing where you get your vehicle exposure was outdoors thats pretty cool. Not a lot of new vehicles though aside from the mammoth and that uber-phantom covenant ship thing on the mammoth mission. There could also be more promethean units, it seems there are only two main types aside from their little watcher things and 343 looking drone balls.
It was a lot of fun and I still have a lot to do, such as terminals. And I haven't even touched multiplayer yet, I'm excited to do that!