Change wording of user feedback importance rating or add more gradings
The thing with choosing between 'not at all' 'important' and 'critical' is that, if one doesn't think a suggestion is AT ALL important, then they can communicate this by simply not voting FOR it, unless there's a concept of a negative vote like Reddit's downvotes feature but if that's what 'not at all' important means this needs to be made clear.
Worded as it is, not at all important sounds to me like I'm actively discouraging the adoption of a feature request that has been so-tagged by me as opposed to encouraging it, but to a lesser degree than things I've tagged as 'critical', because of this ambiguity I would never click on that when looking at an idea I thought had merit and would like to see implemented, but which was lower priority than other feature requests I've also voted on or suggested that I am more eager to see implemented because I don't want to inadvertently 'downvote' something I'm actually in favour of in case I've misinterpreted what the button does. Similarly the remaining ratings represent an odd scale, especially as, with 'not at all' important not being a real option it becomes only a scale of 2 and the options are marked as important or critical which is kind of different to my intent. If I mark every idea that I am very eager to see adopted as critical and other users similarly think the same way, then essentially every idea will be 'critical' and the rating system will be useless. Critical tends to mean, 'can't do without' but by their very nature few if any feature requests could ever fit such a category because other than bugs, which are showstoppers, any feature request can only really be a 'nice to have' thing even if some of them are more important than others because anyone making such a request has managed to at least use the software at all and so long as one can make cuts and export them nothing can really be critical.
3 Levels of desire to see an idea implemented makes sense, but they need different labels or maybe even something just abstract like stars, or "how eager to see this idea implemented are you? Interested, Very Interested, extremely interested" as this at least makes it clear that if you ever select anything other than 'extremely interested' you're no condemning the very idea you want to support and also by clicking extremely interested you're not misrepresenting the absence of a requested feature as somehow being literally broken software and if you select somewhere in between you're able to elevate one idea above another without necessarily devaluing the ideas that you've classified as top tier most important for you to see implemented.