Metro/ST isn't that bad, I take it rather than rent a car when in Seattle, but I don't venture out of the West Seattle-Seattle-Bellevue core where service is pretty good.
Metro's "mismanagement" is because it is directly accountable to the King County Council and, thus, to politically-motivated voters. One look at route 2 and its difficult, congested routing across IH-5 shows a prime example. Sound Transit, on the other hand, has an appointed board and can move much more quickly.