I think Big Sam is a massively underestimated coach. He's never been given the funds to take a club to the next level. Did amazing things at Bolton until they reached their financial limit (which wasn't much), at Newcastle he was chased out because they didn't like the way he played football rather than the results he was getting (results were rough, but it was a style issue that turned the supporters); Blackburn's downfall began when the Venky's got rid of him (in mid-table) and put his assistant in charge; at West Ham, again, he was chased out because the fans didn't like the style, not the results. One of the big tragedies of my football supporting life was him getting the England job just as he seemed to be turning Sunderland around - we'd survived, against the odds (again), and he was ready to build again. It's great being back in the Prem after 8 years away, but I strongly believe we wouldn't have gone through this last 8 years if Sam had stayed for another year or two. Again at Everton, it was his style rather than his results that got him the sack.
Over in Europe, if a coach had his record for defending, and his attitude to sports science, he'd be heralded at a great one - in England, he's just Big Sam, Football Dinosaur.