As I've read elsewhere and agree with, the ability to customize the OMD is a blessing and a curse. The OMD can be great once you get all the buttons and dials set up for what you want them to do, but doing the setup itself can be a pain the butt because of the menus. Personally, I find the menus more confusing than Canon's, although the CF menus in Canon aren't much of a treat either.
As between the OMD and EPL1 (which my wife has), I find the OMD handling to be much better because of the two dials. In A mode, one dial is aperture the other is exposure compensation, easy, and it comes set up like that I think. Then set one of the other buttons to ISO and you're done. In M mode, one dial is aperture the other is shutter speed (again, I think it comes like that), then set one of the other buttons to ISO and you're done. Easy shooting once set.
And if you set up the OK button to bring up supercontrol panel (which I had to check the internet to find out how to do), then you have access to White balance and other settings. The only other button assignment I did was to set one of the function keys to magnify, to make the AF box is smaller. So if you're willing to go through the initial pain (or can get a shop to do it for you), it's possible to set up the OMD to work fairly simply.
In a few years I'll figure out how to use the art filters, lol.