Would that that had better graphics. Half-Life: Source is just as dated as the original, except it has ragdolls and the cliff face has a very rushed 3D backdrop instead of a 2D one. Truth be told, I’d rather play Half-Life over Source, because at least for that I can use the Blue Shift high-rez weapons pack.
As for changes, I really don’t mind Black Mesa not being a perfect copy of Half-Life. It’s not the same game, after all. And indeed, the changes are outright better in a lot of places. The trouble is that the Black Mesa team clearly didn’t like everything in Half-Life, and a lot of the things they “fixed” I actually really enjoyed. On a rail, for instance, has been cut down to no more than half its length, with most of the non-train sections outright removed. Surface Tension has, similarly, been cut down drastically. There was supposed to be a whole other building in-between Barney letting you into the weapons store room and getting to the cannon to blow up the gate. That’s gone completely.
I wouldn’t go as far as to badmouth Black Mesa for it, but it really is considerably shorter than the original Half-Life because it simply misses large chunks of level in many, many places. As well, a LOT of the platforming segments that still exist have been bypassed almost entirely. Residue Processing is the most obvious. There’s no more jumping on floating meat chunks, the pistons room has partially-collapsed catwalks that provide static rest stops between piston jumps and the mixer tank no longer requires you to jump from mixer to mixer, because there’s a path which leads to the forward mixer and right out to the next room.
And for not being a carbon copy of Half-Life, Black Mesa still has sections that ARE carbon-copies of Half-Life locations. The main chamber in Blast Pit is a perfect recreation, right down to where the grating on the floor is, where it’s broken and even the hidden area that you have to be pulled up into by a barnacle creature. There’s also a spot in Questionable Ethics - climbing a set of stairs - that’s one-to-one exact with Half-Life, right down to the enemy spawn points, and those are non-talking enemies.
If anything, I wish Black Mesa were longer, and I’m not just referring to Xen. I want more “On a Rail” and more “Surface Tension” and more "Residue Processing and so forth. I can see the need to cut them down as a Source engine game takes a LOT longer to make levels for than an old Half-Life style 1990s FPS, so I’m not holding them to task… But I miss the chunks that aren’t there.