Let's forget the three games and rely on the 61 games we played last season.
Maguire, may have his weaknesses, but he is pretty good on the ball, especially for a defender. Lindelof, same case as Maguire, although I'd agree he isn't as good. Shaw is among our more press resistent defenders - he's had concentration issues, fitness issues - but would be unfair to say he's average. Hell, if we look at the games when we beat big sides, Shaw was instrumental in getting the ball forward. AWB, I agree, he hasn't done as much as one would like. But he did show signs towards the end of the season (but like I said earlier, the sample size is too small).
I refuse to believe that Ole isn't a good tactical coach. If that hypothesis was true, our record against bigger sides wouldn't be as good. Hell, if you look at our record, it's better than what Mou managed with us, what Poch managed at Spurs and might even be better than LVG's record with us (and that was at a time when every PL team was bang average)