In many cases, MLB prospect rankings are similar to NFL and NBA mock drafts -- they have to be taken with a grain of salt. Obviously they shouldn't be taken as fact; however, people love lists and they're still interesting to look at.
With that being said, Marc Hulet of FanGraphs recently completed his project of ranking the top 10 prospects in every organization as well as going back and looking at draft picks from the last few years (in the first three rounds). According to Hulet, the enormous task took more than five months and 30,000 words, so I'd guess he has a decent idea of what he's talking about, to say the least.
On Friday, FanGraphs is going to post Hulet's top 100 MLB prospects list, but yesterday his top 50 American League prospects list was posted. Here's where O's prospects ranked on his list:
6. Brian Matusz
19. Josh Bell
36. Brandon Erbe
39. Jake Arrieta
42. Zach Britton
Not bad at all. The only real surprise is the high ranking of Erbe, who didn't make Baseball America's top 100 prospects list. But Erbe has a ton of potential and certainly has the talent to keep advancing through the O's farm system.
Anyway, go check out Hulet's complete list, and keep an eye out for his top 100 MLB prospects list on Friday.