Be sure to add your reviews of F1s in these games if you have owned and/or played them.
I shall kick it off with Midnight Club 3: DUB Edition, which I have on PSP; and Forza 2 which I have played before on a 360.
Anyone with better images than what are here (I just did a quick google search for the mclarens in these games - easier and clearer than taking my own!) please let me know! And please contribute your own views on these games, and any others you have come across!
MCLAREN F1 LM
Midnight Club 3: DUB Edition on
PSP
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Generally well rendered. Air vent/scoop on one side only consistent with real LMs. Main problem: Appears to be a turbo blow-off valve (?) sound 
MCLAREN F1 GT
Forza Motorsport 2 on
Xbox 360
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The best look at a GT we're ever likely to get! I wonder if the renderers (?) got to look at one when renderising (?) it??? Appears very highly detailed (and fitted with the thinner, seemingly more recent rims - as opposed to the Scottish photoshoot ones). This game also features the 1997 McLaren #41 Gulf Team McLaren F1 GTR, and the 1997 #43 Team BMW Motorsport McLaren F1 GTR - both to a similarly high standard.