Sry but to just look at win rate is a bit silly (it's also 33 percent at Espanyol and 38 at Southampton?). And how can anyone expect silverware at Espanyol or Southampton? Tottenham is the first side where he could come close to winning anything and it's a real possibilty this year. Moyes has a better win rate, but that doesn't make his job at United anything better, because of course you expect a team like us to win more games than Espanyol or Southampton. He took Espanyol over, when they were pretty much relegated, and with him they got a comfortable 10th place in the end and a solid second season after that too. He was sacked in his third season when things weren't that great anymore, but it's already good to survive there as long. He took over Southampton during the season, when they were a pointless midtable team and one season later he finished 8th with them and then already left. All teams played good football too and he is doing fine at Spurs now. Yeah the PL or at least the big teams are shit, but he is still doing a great job at Tottenham, it's not like we, Pool or Chelsea are anywhere close to them this year.
To just look at the win rate and to ignore which teams he took over (he improved all of them) is a bit unfair. Just a example, when you are the new manager of a team, which lost 20 out of 20 games and you leading them then to 5 wins, 4 draws and 11 defeats in the next 20, then you have improved the team already and it would be unfair to say you have done a shit job just because it still doesn't look that great when you only look at your stats.
I also don't think a comparison with Moyes is fair, Moyes always lacked the mentality, his big games record was absymal and he was only proven at one team, which he could barely improve after 2,3 seasons and then he stayed there in his ambition-less comfort zone for a decade. Pochettino is already more promising and if he wins silverware this year, then it's no contest anymore imo. That doesn't mean that it wouldn't be a risk or a gamble to an extend, of course he is not as proven as Jose or Carlo, but he is at least a guy who has the potential and could step up imo. Moyes was never in that category