Replace "commercial" with "enterprise" and I agree completely. Amazing how bad software that costs so much can be!
(side note: I might have accidentally down-voted you as my hand brushed over the screen. If so, I apologize and hopefully someone will give you an up-vote for me to replace it.)
A lot of commercial software has pretty good usability, especially when the company doing the software realizes usability = people like = less support costs.
Now, for truly horrific usability, nothing beats enterprise software with those big money support contracts. Very much like American car companies in the 1970 / 80s which viewed service as a profit center.
I tried both Open Office and GIMP. Experience is vastly less polished than Pages or Photoshop. I'd even say Pixelmator is a much tighter approach than GIMP.
