Some guys look "bad", b/c some/most MLB guys are really, really good. Think about this----receiving a grade of 94 or below is considered below AVERAGE....That is insane. And here's the thing. Those implementing the idea that an umpire is bad, are people who have no idea what it takes, to owrk at that level. Their opinions are based on some mixed tapes off YouTube, for missed calls.
I agree there are umpires who are bad....But think of what you are comparing them too...Its like comparing a Porsche to a Miata....
No chance using the same guys for the plate is a good idea...Or even doable. Dudes would wear the **** out. Ever worked a 9-inning game, for 3 hours, on a filed where the temp is 120+ degrees? Yeah, good luck doing that multiple times a week. MLB crews are of 4. Meaning you work the plate on Monday, your not on the dish again until Friday. If they changed it to where you were working two plates a week, on top of working the bases, umpires would drop like flies.
Sports has been filled with bad calls, bad officials since its inception. That isn't ever going to change. Its simply part of the game. But every year, people seemed shocked of this....Crazy.