Action Half Life 2 is designed to simulate the experience of being in an Action movie. Movies like Hard Boiled, Face Off, and Die Hard are the inspiration for AHL. AHL2 is AHL reborn on Source engine.
It's still early days I guess, but as with the first version of this mod it struggles somewhat to find a sweet spot for things like movement speeds and friction regarding the acrobatics etc. but in terms of level design and overall polish it's very well put together and the new 'grindhouse' aesthetic is doing huge favours thematically, so big thumbs up there.
If you liked AHL (either HL or Quake) then you should also like AHL2. Fun mod to play. Only minus points for the notorious crashes and map bugs which for some reason got ported over from AHL. Otherwise you should not miss this if you liked the original AHL.