THE GAMES: Any/all of the games (especially Halo 3)
THE FEEDBACK AND THE SOLUTION:
I (and many, many other XBOX players that I know/have seen) would politely request of you for an FOV slider, added to the MCC experience (for both campaign and multiplayer).
It doesn't have to have a HUGE range (considering performance and optimisation on the XBOX ONE), but it would accomplish wonders in making the experience better for a large margin of players. The field-of-view is very small in games such as Halo 3 and taking into consideration the combination of this and the lowered reticle placement in Halo 2, 3, 4 (and Reach coming soon), some of us (myself included) can feel a little bit claustrophobic after playing for a while. Halo 3:ODST is ultimately a more comfortable option with its larger field-of-view, but it doesn't have a PVP mode, so we have to stick to the other games with their small field-of-view (CE is fine in this aspect) when it comes to multiplayer. It's a pretty big deal.
Giving the playerbase more options and room for preferences is always a good thing, and could help pull in new fans to the Halo universe if the quality-of-life of our franchise is discussed, and spread throughout the game industry. If people see that the Master Chief's Collection's fans are raving online about the options and choices they are given, maybe they'll want to join in the fun. :)
If you look at other forum sites and discussions, you will find that a FOV slider on console is very much in demand and would definitely be appreciated, so it makes sense to consider it. Also, keep in mind that there are other 60fps console FPS games that feature a FOV slider, and don't suffer too much from performance issues or visual distortion, even if considering other factors such as optimisation and visual fidelity.
This doesn't mean that fans are here holding pitchforks yelling "we want an FOV-slider!", but a lot of my friends and I would love for you at 343i to simply take it into consideration.
For the fans. :)