Whatever you beleive, 576i (interlaced) can only show 30fps (PAL60).. it cannot show any more.. that's a fact..
so a supposed 60fps game over 576i/480i cannot show 60fps no matter how much you think it does..
However, I do agree that you should just about be able to see the difference between 30 and 60fps on a display capable of actually displaying 60fps (any 576p/720p/1080p set do), but that difference is extremely minor, and to most almost indistinguishable.. it isn't really the fps that makes it smoother.. and here's why
In answer to the comparison of games.. well, looking back to PGR2/GT or similar, if you look at the graphics make up, all the 30fps titles have two things that would make any slow down in frame rate/30fps issues much more obvious
1. Lots of 'close' detail.. having lots of 'hard' vertical edges close in the field of view means any panning shots will exxagerate any fps issues.. if it's just some rocks/mountains much further away with soft edges, this can hide panning stutter quite well. As an example, take a ruler and put it 10cm away from your eyes, and move it at speed accross your field of view.. it appears to stutter.. now get someone to move it 1M away, and waft it from side to side.. you will see that when up close you don't get a smooth effect, but when 1M away you do..
2. The colours are a little muted, again any contrasting areas give your eye something to notice any fps issues on.. on quite low contrast games (GT/RR) there is less for the eye to use as a point of reference..
I've noticed that all the supposed super smooth 60fps games all seem to be less complex by their nature, and objects are much more spread out, thus even if they wheren't 60fps, they would still look smoother then their more complex counterparts.. this must be true or people wouldn't be claiming these 60fps games where smoother on their SD TV's when they could only actually see 30fps anyway..
As for GoW.. go onto
www.xboxyde.com and download the HD first 10 mins of play video.. if you can see any lack of smoothness in any panning you have a poor display/setup..