I thought Reach was the best Halo game so far. What kind of stupid little things are we talking.
-Certain stupid armor powers that slow down the pace of an already slow paced game i.e Armor lock and active camo (the rest were fine).
-The fact that the game still tracks every single betrayal I've ever done in previous games, which means if I accidentally kill one person they get the option to boot me straight from the game and of course they do with it being Xbox Live. The first week of the game being out I was in a Banshee boosting away from a fight while in mid air, one of my "team" spawned on top of the Banshee while I was running away to get my shields back and he gets splattered and there was **** all I could do about it, of course I was booted straight out of the game for something I had no control over, this wasn't an isolated incident either.
-I was playing one sided CTF on the attacking side and it was such a ball ache getting the flag back to our base because the enemy were just literally spawning on top of each other at my own base, yet we were spawning half way across the bloody map
-The reticle bloom was the single worst addition to the game, since it added a random factor to the combat where someone could spam the trigger on the DMR and get a lucky kill on someone who was actually aiming and timing their shots. It also made longer range DMR battles pretty much pointless, an example being that on Halo 2 & 3 I could kill someone half way across Coagulation/Valhalla with a BR quite easily, but in Reach on the Bloodgulch forge remake (I forget its name) I was struggling to kill people in Team SWAT with 3-4 DMR bullets to their heads at the midpoint of the map from my base, yet in Halo 2 & 3 I would make that shot 9/10 times.
-Then we get on to the maps being the biggest fail of any halo game with them being ripped straight from the campaign. I'm aware they were made this way purposely to be used in both SP & MP, but as a result they ended up being some of the most boring and terrible maps that I've ever played in a Halo game. The only thing that saved the game were the forge recreations, but again those were fantastic maps from Halo 2 (& 3?) so they don't count
-The health system returning was a stupid idea as well since it again slowed down the pace of the game, I had to pretty much run back and find a health pack after every single fight, I mean am I playing in 2010 or 1995?. All I can say is thank **** that 343 has realised this and returned it to how it was in Halo 2 & 3.
-The majority of new weapons were crap as well especially since the ones they replaced were vastly superior, BR > DMR, beam rifle > focus rifle, brute shot > concussion rifle, I will say I did like the needle rifle even though I did miss the carbine.
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Enough for you?

343 seem to have addressed most of my problems with Reach and improved upon Halo in general (e.g being able to join mid game so you're not permanently a man down if someone quits) so I'm actually looking forward to Halo 4

Where as if it would have been Reach 2.0 I would have avoided it like the plague.