It really depends, and both have their upsides. Some games genuinely have such a galactically ugly MC that it distracts from everything else, to the point where the game isn't even playable. In those cases hiding the face would obviously have been better. It's also somewhat better for immersion, but I do agree it makes some scenes harder to do right, and POV kissing scenes never work as well as they should.
Im fine with the MC having a face. If the MC is going to have a body it should have a face I can see IMO. I don't like the weird shades over the eyes and bald heads so you can imagine your own face.
some games that do such a thing with the hiding can be very creative with their camera angle...... it can be fun if it is a very large duration game then i think it will get distracting eventually though..... but i always like to see what angle they come up with for such scenes..... it is more disappointing when they hide the face and do not do these creative scenes where they try and hide it personally for myself