Some of these entries are alright, but others are just terrible. Chell from Portal? The story of Portal is about GLaDOS, while Chell just fulfills the role of a silent, everyman protagonist who is there to complete challenges and carry things forward, and aside from having a name, is not really fleshed out beyond being a generic test subject.
While Gordon Freeman might share a few similarities with that design, he is arguably a bit different, in that he is the central, pivotal character that the events of the games are centered around, and while Gordon, much like the player, might not have a clear idea of what's going on in the game world, the rest of the characters tend to turn toward him as the driving force behind the events that are taking place. And most importantly, he has no equivalent of GLaDOS to upstage him.
But, wait... Gordon Freeman is number three... Freeman... Threeman... Half-Life 3 confirmed!?