I'd say the 5* odds need to be improved to at least 11% - that's still about a 27% chance not to get one on an 11 pull vs the current 50/50 roughly
I don't mind 6*'s being unicorns, but I'd rather expect a 5* vs taking the horrid 50/50 chance
3* are fillers, and annoying ones, heck within a year 4 stars are pretty much fillers - I have a few with a skill or 2 to up.