Nice choice's there kosmiq.
4 of those games would definately be in my top five, the only one not making my list would be 'Prey' but only because I havent seen it yet.
You are right about the HL2 cinematic texture pack, it definately improves an already impressive looking game!
But I dont know if I could actually rate from 1-5. I would only be able to say they are the top 5 but in no specific order.
As well as the 4 kosmiq has mentioned I also think Ghost Recon Advanced Warfighter looked very good!
Vietcong was impressive when it first came out.
Medal of Honor Pacific Assault looked good, Men of Valor also looked good.
Even Need for Speed Most Wanted looked impressive.
There are just to many games to narrow it down to the top 5, let alone pick the top 1!!
There are many other games which could possibly appear on anyones list.
Still waiting for S.T.A.L.K.E.R. to appear and also 'Crysis' is looking very impressive, from what I have seen anyway!
Btw, the only way to truly rate a games graphics is if you have viewed it with all settings turned up to the maximum.