>>717084481
>>717086887
The big difference between the 2 is that HL1 was still closer to Quake, so enemies would move around fast but come to a standstill when they attacked, if they weren't leaping at you.
Basically, they couldn't move AND shoot at the same time.
Additionally, hitscanners had a wider spread but the alien enemies were projectile based which led to more diverse sets of combat encounters compared to HL2s flavors of Combine hitscanners.
All of this, combined with the balance and creative uses of HL1s weapon loadout (which let combat have a bunch of immersive sim qualities to tackling enemy formations and manipulating the AI behavior, led to HL1 being really fast-paced, but also very tactical compared to Doom or Quake.
In HL2 they nerfed the speed, took an axe to the weapon roster to really highlight the gravity gun, let enemies move AND shoot at the same time with a higher degree of accruacy, and sacrificed the enemy variety in favor of the immersive themeing of the Combine struggle.
Thats not even to mention how enemy pathing was broken in HL2 compared to how it was supposed to be, which we saw more of in Episode 2.
AND how they made maps and arenas WAY bigger to allow for gravity gun/ and vehicle shenanigans, so that constant moving and weaving between cover was kicked to the curb in HL2.
Also most of the gunfeel is so much better in HL1 than HL2 imo. That freaking pistol and smg pale in comparison to HL1