Fans are fickle by nature. If you'd asked the same question when we didn't sign a player for a full year, the result would have been very different. Alternatively, when we came that close to winning the league, who would have said no? A week after sacking Pochettino, the split would have been different too.
Truth is, you have to take the long-term view and accept that you don't know everything that's going on. Nobody would argue that we're in a better place now than we were when he took over. All things considered, he's done a good job but he's also made some huge mistakes. Football (and probably the Western world but that's another debate) is going through a transition phase at the moment.
I agree that, on a personal level, I'd rather have Levy than any of the alternatives
@Gutter Boy mentions. But he will always be as good as his last transfer window.