The only one of our transfers I'd argue that should be in a 'Top 10 Worst of the Season' (based on the FM-style performances vs price) would be Obertan. Santon, not a fucking chance. I'd not say he's been one of the most brilliant ones but there's no way he belongs anywhere near that sort of list, he's been 'areet' at worst.
As for the mackems, I'd say Wickham looks like a waste of time for the money they paid and El-Mohammady has always been piss poor and making him permanent was never going to be a good idea.