to be fair: i don't know that ideologically they differ that heavily from the Russian ruling class. all of the legal parties are varying degrees of nationalist, with most of them being explicitly ultranationalist. if you want to escape from people who can be analogized as or just are functionally Nazis, i think you're generally going to have to look to the opposition to find any (and even then it's not a guarantee--Navalny has well-publicized and suspect comments in this regard).
People are cheering for them, and I get it - somebody agains Putin, but I can not imagine that someone that forcefully changed Putin will be better for Russians and even more for the rest of the world.
Since their leader has no sway with the oligarchic class that effectively holds power in Russia, it seems unlikely he would be able to consolidate power. If somehow he offed Putin it would be more likely to end in civil war IMO than in Prigozhin as head of Russia.
You're absolutely right. It will lead to nothing other than civil war. Which is how Putin will spin it - he'll try to say that since Wagner are nazis, that they were actually working WITH the Ukrainian Nazis and NATO against Russia etc. blah blah blah
As much as I'd love these monsters to go to war with each other, it would mean civil war in the country with the most nuclear warheads, and that makes the prospect something I can't celebrate.