Brown, Singleton, and Cosart seem interesting. I saw Trevor May twice last year, thought he was over-rated, no better than Kyle Allen. Don't like that system as much as the Mets, but it's not too bad.
Boston Red Sox seem to be one of the most over-rated systems recently. Anthony Ranaudo is interesting. After that, Khalish and Iglesias are at best comparable to Nieuwenhuis and Tejada, and not off to good starts. Yamaico Navarro can hit, and can probably play a decent 3B, and might be under-rated a tick, and Oscar Tejada could be good, but after that there seem to be so many guys in that system who have been over-rated. I think it should probably be bottom third overall.