>>273023512
Fisherman here, I really think they are all worth playing, you can even play the first and its DLC in VR.
They don't take that long, and they have a lot of cinematic moments in first person, you are never not in control of Gordon.
With that being said, the real fun comes when you start looking what people have made with Hammer and such. There is basically infinite content to play thanks to Half Life. Not all of it is good, but it's all worth trying out.
Half Life is a real rabbit hole, I guess.