I think they should bring back the downvote button. With just the upvote button, it's akin to something like Facebook likes, which was not the intended purpose for the rating system.
The original rating system should have stayed in place because now even coming here for help, it's more difficult to discern between legitmate information and false information. Believe it or not, lots of false information gets passed by members who offer hackneyed solutions.
The up vote used to show research effort; it is useful and clear.
The downvote used to mean that the solution does not show any research effort; it is unclear or not useful.
So now we only have an upvote button that serves no actual purpose and have to wade through the rest.
It's a broken system.