Bill Hohn: Worst MLB umpire or merely the most glaring?

[cc6]

In the second inning of the Blue Jays-Mariners game, Bill Welke called a Mariner runner safe at first even though they clearly tagged the runner AND he went off the baseline to avoid the tag. The runner before him reached on a hit by pitch that never actually hit him. I know questionable calls happen, but it was frustrating watching this in what could have been Doc Halladay's last start as a Blue Jay. Guess it happens though. It still seems like a travesty that there are MLB umpires like Bucknor and now apparently Hohn, who probably aren't as good as some AAA umpires but who keep their spot just because they got there first.