Call me a die hard fan, now i didn't expect it to be a 100% faithful replica of HL1, but some things just throw me off. You don't get the crowbar until way later than HL1, as with the pistol.
I kept thinking I had missed the crowbar and backtracking through zombie-infested hallways I had already legged it past, looking for it. I was not happy when it finally turned up further on. And guess what else: thanks to a guard following me for a ways and then getting killed by a headcrab, I managed to procure a gun before I ever got to the crowbar. Talk about breaking flow!
Also the iron sights on the revolver is just weird. It keeps making me think i have iron sights on my other weapons and keep accidently firing grenades with the AR. I also don't recommend using the ironsights at all since the gun takes up 75% of your FoV and (ironically) doesn't seem to be as accurate. I'm not sure why they bothered with it at all since the iron sights don't actually improve your weapons accuracy like standard modern FPS iron sights mechanics.
Not to mention it's barely even an ironsight. I thought the point was for there to actually be a thing that points at where the bullet is going, but this is a tiny little bar along the top of the gun that doesn't even line up with the shot. The bullets actually go in the gap to the right of it, in my experience.
I get the feeling it was included more as a troll than a real feature. As a way of saying, "You console kiddies like ironsights, do ya? Here's your fucking ironsight! It makes the game even harder to play!"