The Spurs of last season were an extremely solid defensive unit, as strong as any team in the prem could offer, but right now they look a far cry that. They pressed hard, like they always do, but they seem to lack that "bite" of last season. Something is missing, can't quite put my finger on it, but for me they look weaker defensively - as a collective rather than individually - and quite frankly a team with more intent to attack may just come up trumps against them. Certainly look susceptible to counter attacking.
From an attacking perspective, without the combination of Walker + Rose providing width and pace in abundance, they lack balance. Alli in particular is missing Rose, not a solitary dribble or pass of note in the first 2 games, and considering he is Spurs' most productive player in the final third, he needs to take responsibility and step up his game. Spurs look toothless without his creativity.