yes he took over a team that finished 6th, added tomori, Wilson and mount (which even then was a ridiculous level of signings for the championship) and actually managed to get less points the next season.
everywhere else he's been has been abysmal.
he's had a number of slightly fortunate results since taking over Coventry, including a dodgy last minute penalty against us, and a last minute winner yesterday where their goalkeeper inexplicably dropped a hoof into the box straight at the feet of their striker.
that said, even taking those into account they've definitely seen an improvement. and I don't see any reason he couldn't be a success at the job, just because some of his earlier attempts at it were sub standard.