With Prey it was the creative use of three-dimensional space that impressed. But while other games might have looked better, boasted better credentials or pitched bigger battles, only two titles managed to create that special buzz that maybe we were seeing something new here, something different and exciting and with a lot more ideas than your average market-researched sequel. Of course, there were a lot of other great shooters there - UT2007, Call of Duty 2 and Quake Wars to name but a few.
Opinions differ, but for me the best PC game of E3 came down to Prey and F.E.A.R.