I really love the Rumble! It's things like this that keep me coming back regularly. I've nominated a few times, and I would like to be more involved. I think that it's difficult to avoid nominating the same people time after time because those few people write really exceptional reviews, but I've tried to nominate newer people instead.
It is difficult to keep up with every single review that has been written in order to choose the best newer contributors' reviews but I think it's important. Even the top 10 reviewers started somewhere, they didn't just give birth to those spectacular reviews from day one. Well, I assume they didn't. OK, maybe a couple of them probably did.
I think that a contributor should only be able to win once every 3 months or something similar. There should be a list of those winners posted, or even better, if somehow there could be a page set up that lists just the eligible reviews (author hasn't won in 3 months, or whatever time frame works), and as mentioned previously there could be a nomination button on each review, it would make it so much easier keep track of them all and to effectively nominate the best ones.
I think this could be a worthwhile program that would encourage newer reviewers to really do a great job, while bringing exposure to more reviews (which means exposure to more products) each week. This could make the newer people feel more positive about their chances of being nominated and even of winning, and also give them a realistic goal to try to attain in terms of review quality. It can get discouraging seeing those Lamborghini reviews week after week when you're still still just trying to trade in your Toyota for a Lexus.