Overrated signings in the first place. Were those players even signed by him?
To be fair to him, his results are not that bad. He just seems so awfully stubborn. His high line got destroyed at the Etihad, and he corrected it and switched to a more deeper approach after that game. And it worked so fair play to him. But then after 3 victories and 1 draw he decided to try a high line yet again against Liverpool and they got destroyed yet again. I'm not so sure he deserved to be sacked though.
Spurs may have made a huge mistake. It remains to be seen.