To be fair, some Combine do carry canisters on their backs that can be shot on the nozzle to kill in one shot. As Chaz says, the laser sight attachment* would make headshots incredibly easy to make, but shooting the nozzle is still tricky, so it is quite a good balance. Headshots should still do more damage though.
Fair enough to TixyLixx’s comments. Don’t agree with all of them (didn’t have a problem with movement or climbing ladders, was fully engrossed with the story and thought it looked brilliant throughout) whilst others are just preferences (less platforming in Half Life is surely a good thing!). Do have to question the comment on “no Half Life game has had good AI though”. The first HL was revolutionary at the time and held up well for ages, perhaps only really being bettered when Crysis came along. HL2 went for a more controlled approach that was perhaps weaker in some areas, but was still better than what we were seeing from most FPS games, particularly as we were heading into the era of the cover shooter that required minimal AI.
I would agree that Alyx’s AI is fairly average. Although, as the game plays closer to a cover shooter, I would be interested to see what modders do with it once they decide not to worry about overwhelming players with enemies.
Also, in regards to your comments on this only being played by the hardcore, that seems unlikely. Sales of VR headsets have exploded since the game was announced and I expect they will again now that it is getting such good reviews. This will be the first game many people play with their headset. Certainly, as someone experienced with VR, I wouldn’t mind Valve taking things a bit further, but I do not think it is the wrong approach they went with.
*I’m thinking I might try a play through without getting that upgrade to see what difference it makes. The game would certainly be a lot harder.