There are a lot of issues with various spells, but this post is about the ones that are flat out broken in the progression, i.e., where a higher level spell is actually WORSE than a lower level one.
1. Healing: Chloroblast (62) - Trushar's Mending (65) - Muada's Mending (67): This progression is broken. Trushar's is worse than Chloroblast in every respsect, and Muada's is less efficient than Chloroblast. This has been mentioned before, and the devs have indicated that a fix for Muada's is planned but nothing really has been said about Trushar's.
2. DoTs: Scorpion Venom (61) - Turepta Blood (65) - Chimera Blood (66): This progression is broken. Turepeta Blood is LESS damage than Scorpion Venom, and it's LESS efficient. It is a complete downgrade from the previous spell.
I've brought both of these up before. Like you mentioned we were told that muanda would be tweaked and some other changes might happen, but I still haven't heard a time frame on that. I'll ask again and see if there's any update at all.
Oh yeah i forgot about turupta blood...both of these have been broken for a really really long time. I made a nifty little chart for the healing progression in another post "trushars mending"