I think overall the premiership has increased in quality,A few years ago, City Utd Arse Chelsea Liverpool Everton would have all beaten them at least once, possibly twice. All are a pile of fucking shit in the Prem. Most of them would have beaten Spurs as well for that matter.
This season at times West Ham Southampton Liverpool Spurs Stoke & Arsenal have all played some pretty decent football at times though rarely consistently. Villa have been the only consistently poor team, getting the points that Leicester have done is a pretty impressive achievement. I also think that this Spurs side if they stay together will be a top team for a few years, not to sure that any non title winners for many seasons would have beaten them with any consistency.