I feel bad for that guy, they mocked him pretty hard
I just installed an ICS leak on my Epic Touch 4G (aka Galaxy S2) and I switched briefly from the Touchwiz launcher to the stock ICS launcher...and I ended up switching back.
Maybe there's a way to get more than 5 homescreens, but I think I am already used to having 7...and I missed the calendar widget that is built into Touchwiz. (I'm sure I could have downloaded one but, really, there's no stock calendar widget? That's a total no brainer of a widget...) I missed being able to long press the homescreen and add widgets that way, vs. having to go into the application drawer and go to the widget tab to pick them that way. I missed being able to scroll off the beginning of the app list (or the first homescreen) and then have it wrap around. I missed being able to pinch zoom out and see all your homescreens or apps, and then jump to the page you needed...
The persistent Google search bar on the stock ICS launcher is nice, though