Perhaps a big portion of Halo Series fans is admiring the most iconic super-soldier: Master Chief. It could be obviously understood that Master Chief stole so many hearts for his personification from Halo Combat Evolved to Halo 3. The big dude that confronted so many aliens, from the dumbest to the toughest, rode extreme terrain and exploded a gigantic spaceship. But, the heroic term doesn't deserve for Master Chief only. The group of spartans that called "Noble Team" also deserve this honour, in the story that preceded Halo Combat Evolved that brought Cortana to the Pillar of Autumn.
Briefly,
Halo: Reach is a magnificent prequel for the Halo Series that told the breath-taking lore of a little piece of the Halo universe in a simple way. It feels exclusive from the other Halo with some of the soldier power that pretty useful while in the battleground. Surprisingly, the multiplayer for this game is quite good tho.
Suggestion,
Yes, if you love the Halo series, you should buy it. If you have a PC, simply buy Halo Master Chief Collection (the price is really cheap for a collection of games) then beside you'll get Halo Reach, you also get Halo CE, Halo 2 - 4, and ODST. Convince your friend to buy it too, then you will get a great experience on playing the game's multiplayer