Matt James
Game Developer
The OGL was an absolute masterstroke. It gave a huge swath of fans, many of whom had been alienated by TSR's actions, a sense of ownership of the game, and the ability to (try to) realise that secret fantasy many of them had harboured: to publish their own stuff for the game.
Two quick points.
(1) I agree with you about the OGL. To a point. We are also experienced a flooding of completely horrible products. Normally, the market would sort this out, and to a point it did, however there were so many D20 products out there that it was very overwhelming. I still look through some of it scratching my head. So, there are two ways of looking at that era

(2) There is very little that gaming companies can protect. Rules being one of them. As long as you do not trample over terms such as Mind Flayer and Orcus, you can do as you please. There is a very prominent 3PP that publishes 4e content without challenging WotC's IP, nor do they subscribe to the GSL. The only thing that the GSL does, is approve use of certain things that are covered by their IP. You also get to slap a cool 4e logo on your product--which may or may not benefit you.
LONG LIVE SUCRO! (Orcus spelled backwards)