As Apple gets more and more market share, quality is going to dip. It happens in every sector fashion, food etc. It's a shame but can't be helped.
Yep - just look at Leopard. More bugs than Tiger ever had and seems slower too. Boot times especially are longer than I remember. But hey, they're making money, so they probably think "why bother rushing to fix things when we still get a silly smount of money - just release new stuff to wow people".
Shame really. I installed YDL on my eMac G4 and that feels way snappier than Leopard on my C2D MacBook.