In defense of that buy, Luque was an above average player in for Deportivo in La Liga. Nowhere near worth that money, but at least he wasn't a completely crap player.
The PremierLeague is a mess. It seems like being a physical freak is necessary. That's not what football should be about.
Players like Andriy Shevchenko and Hernan Crespo (excellent finishers, with great career goalscoring records) failed in Jose Mourinho's Chelsea system because they didn't work their balls off like dogs, preferring instead to have chances created for them to convert.
It's not always the case, and it's not just Serie A players that are examples. Xavi and Iniesta may not be successful if they moved to the PremierLeague because they're small and technically gifted rather than being some mug who runs box to box (Kevin Nolan springs to mind).