Not that he's any authority or anything but Jim Bowden placed Susana at #28 on his top 50 prospect list.
Hassell #7, Wood #18, Green #25, Susana #28, Cavalli #48.
Only thing keeping me a bit down on Susana is the reports made it sound like Bell-Susana was almost an addition to the trade.
A top 50 prospect for a half season of Josh Bell is highway robbery in the era of teams overvaluing prospects. Maybe there are serious injury concerns due to the fact pitchers with cool names and 100+ mph pitches usually don't work out.