Well...
1- The weapons are different from anything you'll find in any other game. Semi-automatic is far superior to fully automatic, in my opinion.
To me the human weapons past CE just suck, they're just not fun to use. I also reckon the BR and DMR are insanely overpowered
2- Combat unlike what they do in most realistic shooters. You can take a few hits, and so can your enemies. Gives you a chance to fire off one-liners.
I find campaign combat boring past 2, multiplayer is awesomesauce though.
3- Beautiful settings, armor, basically everything is beautiful. And colorful.
Aside from the greyish mess that is Reach, I completely agree.
4- Customizable armor, and two different species to choose from.
Elites in multiplayer are cool, and underated.
5- Vehicle combat that doesn't suck. Except tanks beat everything, so never be without one.
Scorpion tank is waaaay too powerful, (I know its a tank but come on) aside from that the vehicle combat is nice. Warthogs ftw.
6- Science fiction storyline that's pretty decent, as far as I'm concerned.
Ummm....no comment...
7- Awesome music.
Daddadada, daddadaDA, daddadaDAAAAAA
8- Hilarious moments, especially the easter eggs and IWHBYD skull.
I Woulda Been Your Daddy, but the dog beat me over the fence
9- Interesting and infinitely replayable campaign, with skulls that force you to change your playing style with every configuration.
Disagree. Skulls are a fun little addition but they barely impact the game.
10- Horde clone that doesn't suck, and doesn't get too damned hard after five minutes.
Its good but in Reach its very repetitive.
11- Gravity Hammers. And Spartan lasers. They deserve their own number.
Only thing that looks more awesome than a Banshee flying towards the sun is a Banshee being shot down as it flys towards the sun by a miniture sun gun...thingy.
12- Assasinations. Doesn't matter which game, it's always cool to ninja someone.
Yeah, but we need a way to stop kids letting all their teammates die repeatedly just to shiv someone in the kidney.
13- Enemies whose sole purpose is comic relief. I have a big grunty thirst.
But then the game goes all serious and shit and takes itself way too seriously. I reckon the whole damn series should be intentionally funny.
14- Cool expanded universe, with all those books and stuff.
I wouldn't know, but from what I've heard they're damn awesome.
15- They were overhyped, so all my xbox friends were playing it together on launch day.
Too bad Reach sorta died after a couple weeks. Few of my friends have touched it since.
16- The beta was amazing.
From what I heard yeah. Betas are damn good anyways.
17- Great stat tracking on Bungie.net
Oh god yes. Every MP game ever take note.
18- Screenshots and film clips.
And in an easy to use and accessible way. Hells yeah.
19- It like, totally invented the first person shooter. (Just kidding, but it was the first game I played on my xbox).
Harharharhar
20- Sergeant Avery Johnson. He knows what the ladies like.
Ladies like armour plating.