To be fair, they played well against Man City last weekend. A three- or four-goal victory would not have been unfair. Away legs in Europe can be tricky, I don't think we should read too much into that.
Redknapp's comments about challenging for the title were ridiculous, though, and probably stemmed from hubris induced by their admittedly impressive finish last season.
Tottenham can beat anyone when they are 100 per cent. But they play a very intense game. This may cost them when they have to play two games every week (whether in CL or Europa League). One of the things that separates Chelsea and Man Utd from the rest of the supposed title contenders is that they can play at 70 per cent and still win. When Spurs do that, they lose home to Stoke.