The technology that allows you to create two portals and jump betwixt them instantly is a great concept. The instant nature makes for a fascinating gameplay mechanic.
If only the load screens could of learned something from this instantaneous nature. It reminded me about how much patience you had to have with older games and all the loading screens you had to endure. Loading still exists in modern games, but it is hidden in ingenious ways. You just don't notice it any more.
I'm generally not a fan of first person perspective in games in general. It's a matter of personal taste. The feeling I am just gliding over the ground really breaks my immersion in a game. Plus jumping always feels like some leap of faith.
Why am I complaining about such a brilliant game? Maybe what I'm trying to say is that these niggles cannot diminish the wonderful experience of Portal.
In my own confused and bumbling way.