He'd be a decent keeper for a relegation candidates and low-mid table sides.
In those teams you'd naturally expect to lose more than you win anyway, so a keeper who's inconsistent but occasionaly brilliant works pretty good. He'll win you points when he's brilliant, and when he's not, chances are you probably didn't expect points anyway. Sort of like Boruc is for Bornemouth and previously for the Saints. He's obviously prone to error and occasional brain fart, I watched him his entire career and he's always been like that. But there are also games where he simply nothing goes past him.
In a top-4 aspiring club though? Nah. Top 4 battle is a marathon, consistency should always be the first and last word on the menu.