I kinda agree with this.
For me I just find more replayability in BO2 in BO1. And that's to do with the maps feeling unique and largely not the same. I would say Ascension is closest to Der Riese in layout, and maybe that's why it's a success and one of the more popular maps. BO1 just felt largely the same in some way. The Wonder Weapons in a way felt the same, although they were unique to some extent. I felt BO2 had more unique Wonder Weapons though (I didn't like we always had Monkey Bombs though, need to change it up).
The formula in BO1 feels the same in retrospect. From Der Riese to Moon. With BO2, I appreciate they tried to add on to the formula with Buildables, Bank/Weapons Locker and Persistant Upgrades. It sort of felt like going from Nacht to Verruckt, or Shi No Numa to Der Riese, in that they tried adding something new into the formula which would stay.
With those, I only liked Buildables and to a lesser extent, Weapons Storage.
Buildables need to be unique though. I think I'm the only one, but I really liked the Trample Steam. Your never going to stop glitchers and hackers, and it was another tool for them to use. But I actually liked how it literally changed map dynamics and such. Maybe not to the extent you had to rely on it in Die Rise, but I liked that it was an option in Buried. And I actually want more Buildables that directly alter gameplay like that. The Zombie Shield I liked, but it was a bit OP in regards to how easier BO2 was. Maxis Drone was also nice, and pretty cool it was upgradable. Only other thing I thought was okay was the Head Chopper, but only because it could stick to the roof/walls and wasn't something that needed the Turbine. Everything else I pretty much hated, especially buildable Wonder Weapons. The cool thing about Wonder Weapons is how they changed when PaP, and the story behind, which the two buildable one's don't have.
Oh and also, picking up items to build, needs to be like MOTD and Origins. So sick of only carrying one piece at a time.
Weapons Locker I feel needs to be accessed at a hard/later spot, and shouldn't be accessed at the start. Perhaps even have a timed lock on it, so it can only be accessed after Round 20 or something like that.
I do see the flaws in BO2 though, and understand why people want something more BO1 orientated. For me though, I want something that is a mix of BO1 and BO2, the right mix. Not more BO1 stuff, not more BO2 stuff, but equal stuff.
PS. Regarding the boredom of BO2 and it's maps, it's why I do challenges on them from time to time. Ever tried camping in the Barn without Vulture Aid or the Paralyzer? The Maze with only the PhD Flopper Upgrade, M&S, War Machine and RPG? Only staying in the fog, camping at the bottom of the Spawn elevator, etc. There are all these exciting challenges one can do to spice up BO2.