Van Wolfswinkel was obviously a massive flop, but I agree, apart from that it wasn't that bad.
Redmond and Olsson cost a combined £5.5m, and have both turned out to be excellent signings, and who were both good that season despite our relegation, and have been crucial for us this season as well.
Leroy Fer we only signed for £4m, and sold for double that. Carlo Nash was only bought in as a 3rd choice keeper anyway so wasn't expected to play.
Hooper was also key for us this season, and scored quite a few important goals. If he does well this season and ends up helping keep us up then the £5.5m fee will be justified. Garrido for £1.5m was justified at the time because he was very good on loan the season before. Hasn't done much since but £1.5m is peanuts by todays standards.