Now then, while I really appreciate that you guys take your time to play and review all entries, and it's what I generally aim for as well, I would be careful with expecting that from every single voter (especially when it comes to writing full reviews, aside from just playing them and maybe writing a brief comment). Sometimes, people just don't have much of a free time, and even when they do, playing and writing detailed Jam reviews simply isn't the first thing they want to spend it on. While I agree with Misu that for a great reviewer it takes some hard work and determination to go through many entries; we should not expect everyone to be great reviewers, either.
Obviously, if I were to choose between someone reviewing in detail every game, and reviewing only a selected few, I'd prefer the former. At the same time, if the other option was for that person to drop reviewing altogether, I'd rather have them review these few games. I guess if someone doesn't feel like reviewing in depth all entries (which I can understand, especially if they get relatively little positive feedback in exchange), they could, given enough time and motivation, play all games and do several reviews by request (as those who do request reviews generally care about feedback enough, or something).
It's like with the Jam. We wouldn't want people dropping out altogether just because they feel they games won't be "good enough" and they have "no chance to win", do we? Similarly, I would rather not have people giving up reviewing because "I don't have time to play all entries as much as I'd like" or something.