The polling is certainly flawed, but I don't think that anyone would claim that this list is a completely accurate one. Mostly it is just a for fun type of thing, but I also thinks it fosters some more discussion on the minor league system and also represents a perception of the Nationals farm system from the Nationals fan base (albeit a group of 20-30 mostly diehard Nats fans). RD, I believe you are right to say that much of the later voting is more or so name recognition and there is an element inherent in being a fan of team that tends to steer things like these to more of a popularity contest, but I think that even with the flaws the exercise serves some good purposes.
This list certainly doesn't match up with the top 30 I would have personally created, though I have enjoyed the discussions on various prospects and hearing what other people think about prospects that I may have perhaps undervalued. I would love to do this again next season, whether it be an annual or bi-annual type of thing, but I do think the format could be tweaked a little bit. What if next time, instead of doing 30 separate polls, the 20-30 regular participants submit/post each of their own top 30s and the results are tallied in a manner similar to the college sports polling system? Thoughts? Would anyone be interested in doing this again in the future, whether the same format or a different one?