Slashdot had this covered years ago, literally decades.

1. Upvotes limited to +5.
2. Votes categorized: funny, informative, insightful, etc.
3. Number of votes limited per time frame and user karma.
4. Meta-moderation: your votes (up/down both) were subject to voting (correct/incorrect). good score == more upvotes to spend.

It's a pity that Reddit and other sites didn't follow this model.