Okay, when I booted up the beta, I saw a LOT of good things and a lot of things that had me going, Cool!
The technical:
Just to start off, I could not sprint from crouch. Needs to be addressed. Other than that, I kept thinking I was playing destiny so a lot of other errors were my own. (no double jump) 
To avoid being a negative nancy, I will list equal good things for the number of bad things I list. Everything below is MY opinion only. This is a first impression.
G: I originally said I liked ADS, but then I thought about it and I vomited, sooooo this is not a good, itâs a bad.
B: The control button mapping needs to be worked on. Iâm sorry but B to dash is stupid. There is no good way to say this, but Advanced Warfare has pretty much the same mechanic and pulls it off 100% better. There are better ways to boost than to remap it to B. I would prefer clicking L3 sidewaysâŚ
G: The Aesthetic, ⌠honestly sucks. Why canât the spartans have anything but the faded red and blue anywhere on them? I miss the black mesh armor daysâŚ
B: Health. HEALTH. Iâm freaking dying before I can even react!!! If I have shields, I expect them to be able to take a bullet before crashing on me. Instead it doesnât feel like I have shields, it feels like every bullet is hitting my flesh, and my flesh heals fast. I donât like it. A sheild needs to feel protecting. More health. or resistanceâŚ
Customization is great. I see they brought back the old reach style menu. I like that, and it works FAST too!
G: I like being shown jumping into the arena. Though it feels slow, maybe speed it up a bit, but itâs a good concept.
B: DO NOT LIKE THE FOOTBALL PLAYER ATTITUDE AT THE END. After winning or losing, the âspartansâ do a sort of⌠well⌠it looks like they just won a football game. Forgive me, but the y are SPARTANS, NOT THE COWBOYS. I expect soldiers to ACT like soldiers. Even if they are âplaying.â Chances are, Iâm already pissed off if we lost. I do not want to see their avatars rubbing it in. Unless⌠this is Microsoft scheme to get me to buy more controllersâŚ
Final thoughtsâŚ
I thought this was a step in a direction. Wrong, but itâs⌠going I guess⌠I donât really know how I feel about it. The only thing I have to go by is the sinking feeling in my gut as my first game went on. âThis⌠THIS, is what they are doing to MY HALO?!â Overall, it created negativity. I went in with a blank slate, forgetting all other halos existed⌠to be honest it felt like a third party indy game, not a block buster. I understand there is a long way to go before release, but⌠wow. They have a lot of work. Letâs just say, after Halo 4âs misstep in multiplayer (fantastic storytelling though) they had better get it right. I would say I believe in them, but that would be lying.
Forgive me of my negativity. These are my opinions. Anybody want to correct me on anything? What does everybody think? Am I crazy?