You mean like West Brom against Utd last night or Hull against Arsenal the other week? Of course Numancia aren't Liverpool or Chelsea (we'll obviously never put 4 past them) but they must've been doing something right as they went into HT with the score still being 0-0.
This season our strenght has been that the whole team never gives up and keeps working hard. That has resulted into late late wins (Shakhtar away, Real home, Osasuna away the other way...), which in its turn has resulted into lots of confidence leading into several matches that were over at HT.
This season we tend to break down teams with our possession - eventually they get tired and once they go behind they either start taking risks or just crack it, while last season we were boring the shit out of friends and enemies with our soulless passing around.
Relax mate, that's why I said this 'but really only teams with a good defence would be able to stop that. Just very good buildup play. ' Maybe I should have specified a VERY good defence.