Seriously: how did HL1 on PS2 controlled? I never played it and it's interesting to know how an FPS on a standardized twin stick console controlled in that strange time between Goldeneye but before Halo.
It was a dual-stick game like Halo (and Alien Resurrection before the both of them), but it also had a lock-on option like Metroid Prime. On other portions of the control, the Long-Jump was remapped to just simply be holding down jump, and otherwise it controlled like a fairly standard 2000's console FPS. IIRC it had controller remapping though as well.
Oh, and you could plug a mouse and keyboard in if you wanted to - As with a lot of PS2 FPS games, such as Dirge of Cerberus (Shut up it's a good game.)
Anyway, I'm fairly certain that Black Mesa actually riffs off of the PS2 version's redesigned levels in quite a few places, so I'd say that's a +1 for HL1 PS2.