If the triages are any indication the system currently works like this:
high priority - bug fixes with patches
medium priority - new features with patches
low priority - bugs without patches
So if there's an unfixed viewer bug with 20 votes, it seems to end somewhere in the middle of the pile, behind a bunch trivial fixes with 0 votes each but that someone already did fix.
I can understand that it's a lot easier for Lindens to accept things that a resident already fixed than it is to have to fix something themselves, but it also makes bug reporting and voting rather meaningless since regardless of the number of votes, if you care about that particular bug and can't fix it yourself, you're out of luck getting it fixed "quickly".
The fact that implemented feature proposals gain preference over unpatched bugs, regardless of votes, doesn't help the matter either and makes it rather easy for one person to influence a feature (for better or worse):
VWR-1344 (Reverse order of popups, so that new ones appear underneath existing ones rather than on top) was accepted and implemented with just 4 votes
VWR-2010 (Blue dialogs now display in reversed order) has 7 votes asking for the previous new feature to be undone
If 2010 gets accepted, some Linden spent time accepting the patch and testing it, only to spend the same amount of time a few weeks later to remove the same patch and testing it again, which is rather a big waste of time, all because of the mentality that patches are sacred and *must* be accepted.
(Highlights another personal annoyance I have with JIRA; you can't vote against a proposal, only in favour of it)
I respect the time someone spends to implement or fix something, but that shouldn't mean they just get to jump ahead of the line, so hence the title: focus on the votes and only the votes.
Most Lindens aren't in-world enough, or actually use the viewer enough, to know what needs attention and what doesn't or what is annoying people and what isn't. If something is important enough, the issue starter will have no problem finding votes and if they can't, then it's likely not important to the "community".