The 9400f does 4.1Ghz max IIRC and the 2600 could likely be clocked to 4.1Ghz, that would mean your point about the higher Intel clocks is invalid when comparing these two cpus.
Oh yeah I wasn't making a specific reference to these two processors, obviously it makes no sense to buy a locked Intel processor when there is an AMD equivalent within the price range. My only point is that if you are going with intel for IPC that lead is negligible, their real lead when it comes to gaming is on clock speed and the 9400f doesn't even get that.
I think the real reason to avoid AMD is that if you don't know how to OC memory and your XMP profile fails you are going to be running them much slower and take a 10-15% performance haircut. That being said I also encourage everyone to select good memory kits when buying AMD to try and avoid this problem.