Halo 5 Guardians is easily one of the best games I've played on Xbox One however it has it's shortcomings.
-This is exclusively a review for the campaign-
The main campaign of Halo 5 guardian misses a huge opportunity to introduce us players to new characters within the series. Blue team, which is Master Chief's team and Team Osiris which is Lockes team consist of four man squads. The main campaign was crafted to handle the four player co-op within Halo 5 which overall was a good campaign if you like shooting gallery's. Where Halo 5 went wrong with the campaign was the lack of introduction between these new characters that we are shown for the first time. If you have never read books regarding halo lore, or any other form of halo media then when you play the game you will be lost at who is Blue team, or team Osirus as the game does a horrible job in introducing us. This was a missed opportunity, and where I was expecting an expansion of the lore however 343 studios only seems to care about Master Chief and Cortana.
The story to sum it up is just Master Chief trying to find Cortana, which all just ends up being a set up for the 6th Halo installment, and it was done in a horrible way.
Overall with the main campaign I give it a 6/10. I want you all to know, I bought the game day 1, and just finished it on 2/26/2016. The game never gripped me into the story and thus it took me this long to actually beat the game. I love the franchise, I love the lore, but for someone who this might be their first Halo title, 343 has failed.