Snow Leopard was a huge update for my MacBook, fixed a load of issues, and was screaming fast. This isn’t my faulty memory. That’s how I experienced it at the time. Just because Snow Leopard didn’t fix every single bug ever, and needed bug fixes itself, doesn’t mean it wasn’t a bugfix release because it fixed a lot. And those bugfixes that came after Snow Leopard’s release weren’t necessarily fixes for bugs that were introduced with Snow Leopard, they were just fixed in a Snow Leopard update.