Entire site broken because of one custom module! No pages found anymore. How to fix?
I'm not sure why your menu item above took over all paths, it should have only responded to paths that start with '/MyModule_view'. Maybe someone else can see what the problem is. However, I believe it's still causing problems because the menu registry hasn't been rebuilt. You'll need to clear that out to actually remove the menu item definition. Normally this would happen when you disable the module from 'admin/build/modules', but because you did this manually by altering the database that process didn't happen. If you use Drush (which I highly recommend) you can rebuild the menu registry with

drush cc menu


If you don't have Drush, then you can write a simple script to rebuild the menu even though you can't really access your site. The script is explained in an answer over on StackOverflow: https://stackoverflow.com/a/6912110/318158