depends what you see as acceptable and what you're current rig is, aswell as how much eye candy you think you should be playing with.
The 8600 is gimped by the ddr2 memory but its still fine for COD4 when iv played it on mine, i had all the bells and whistles off but no doubt I could have had a few on, and there will be a few custom configs floating about no doubt.
Mine was running Vegas2 but quite sluggish last night, It would have definately benefitted from a res drop but I found it quite playable, it was probably between 20-25fps.
They are decent performing laptops, just dont expect it to replace a fairly modern rig when it comes to new games, it rips through everything else though.