Thought of this thread after looking at the career of Andre Van Troost and, to a lesser extent, Duncan Spencer.
There's something to be said for the 'extreme skills' way of looking at competitive sport. Bowlers who can swing, cut or spin the ball a serious distance are generally highly valued commodities and so in theory should be a bowler of ridiculous speed.
Alas, it doesn't always work that way for whatever reason, be it due to lack of control with the ball that effectively nullifies their strengths, mental fragility, maybe a poor captain or mismanagement.
So - which bowlers were possessed of a single 'extreme skill' be it swing, seam, spin or speed, but were ultimately mediocre players? Is someone like Van Troost perhaps the best example, or does their overall 'not very goodness' perhaps lead to an exaggeration of that one area of strength?