King Pietersen
International Captain
But you could also say he arrived as an off-spinner, and took 18 International wickets at 72.72, so from that perspective, his career was a massive underachievement. 
I always expected KP to have a massive breakthrough year where he'd average over 100 and be smashing everyone, but it never really happened. He'd consistently average 50, but never had that massive average-boosting year.

I always expected KP to have a massive breakthrough year where he'd average over 100 and be smashing everyone, but it never really happened. He'd consistently average 50, but never had that massive average-boosting year.