Well, as someone mentioned above, the title (and presumed intent) of this article was to determine whether or not the 650i represented a good 'mainstream' chipset. For mainstream use, you want out-of-the-box stability, performance and features/diversity. If the board also has good/moderate overclocking ability, then that's a plus.
IMO, the MSI P6N SLI Platinum fits that description pretty well

. I didn't mention it before, but
here's another review that has the MSI board performing well against the ASUS P5N (and the Striker Extreme, for that matter), in 'out-of-the-box' configuration.
I don't have a 7.1 speaker system myself, but that doesn't mean I won't want to buy one 6 months from now

. For PCI slots, I also have more than *I* can use, but if someone is running a SLI setup with 2 2-slot-wide VGA cards, they lose one PCI slot in either board. That leaves you with exactly one PCI slot on the ASUS board, where the MSI board has 2 left - a better situation for 'mainstream' use (where people may have a TV tuner card, and/or X-Fi or other sound card they want to use, additional raid controller cards or whatever).
As for over-clocking... as mentioned before, to some extent, that will depend on the skill/knowledge of the person doing the oc'ing, as well as their cooling setup. I have no problems believing that the ASUS board may ultimately oc higher (they've put out more BIOS updates), but I've also seen some impressive figures with the MSI boards. Unfortunately, I don't speak Chinese, but if you look around in the "
New Intel Mainboard and related test" forum, you can find several threads where they are getting 450-515+ FSB on the MSI boards.
Me? I'm still running the stock Intel HSF on a E6400 (locked at 8x multiplier), which gets pretty hot as you approach 3GHz, and I need to have a stable system for work, so I haven't pushed it yet. But don;t worry, I have no buyer's remorse - I'm perfectly happy with my decision - it was the right board for *me*

.