IMO, residue processing is one of the chapters where BM shows the biggest improvement over HL. Why? Because in HL, you were navigating through one grey room after another. Everything just had brown and grey textures with horrible resolution and in between that and the murky water, when I did it the first time in HL (and even when I repeated it), I had no idea where I was going. In BM, it captures the feel and the level architecture but there are more individual visual clues to distinguish the different areas and rooms and dagers are much more apparent.
As for Lambda core, the same thing is the case IMO. I had no problem with the elevators, etc. it took me a while to figure it all out as well but it was pure fun all the way. Besides, the coolent water looks amazing . As for the pool in the middle, I was really glad it was there because when I first entered the level, and I got rushed by what felt like about 20 Houndeyes, I got one to charge up right next to the explosive barrels on the upper floor and then jumped over the railing into the pool, escaping the explosion and killing about 10 of them in one stroke. Brilliant moment.
The morter screen: Is the flickering a bug? I thought it was supposed to be some sort of transmission error, static or something. While I agree it’s pretty bad to handle (especially with the garg shaking things up), I thought it was meant to do that.
I don’t really have a least favorite level, I really had a blast all the way through. while I was sad about some of the cuts, what was still there ist still awesome.
My greatest moment of dissapointment though: The scientist in the power section of Blast Pit no longer sits on top of the generator (“this is my hiding spot”) and then gets the shits when Gordon turns the thing on. I always loved that guy. BM makes up for it though with his further comments (“I had to ditch the others”) and the remarks of the second scientist at the beginning of that section who waits for his “friend” .
EDIT: @Bunnykicker: I think you are right. Somehow I remembered the original HL to be much more challanging in that section. Weren’t there quite a few grunts around in the pump sections originally? Maybe I am misremembering here but yea, to me it felt easier as well.