Let me just start off by saying there are a ton of junglers that can 100-0 at level 3. My point was she literally cant do anything after she uses her q and e. That's it. Her autoes hit as hard as maybe ahri's.
I think you are missing a lot of the point and honestly it is understandable as to why. She can get invaded really easily and becomes really vulnerable. I..E She could never fight 1`v1 to a yi or xin or warwick or shyvana etc.
In regards to the charm slow, while yes it is effective to slow, it would be a lot better if I didn't have to wait almost 3 seconds for a charm.
Another point is she power spikes, but in a way that is HORRIBLE. Why pick an ap champion with a powerspike of 2300 gold when you can pick an ad one with an 1100 power spike being able to all in pre 6. Similarly to Diana she just gets outclassed.
I don't think she cant deal with invades early, she can kite out camps easy and keep a high HP pool with out burning smite. I don't think she needs to be able to 100 to 0 some one pre 6, like that's just unhealthy for the game. Shes also a jungler so teammates should always be a factor when you gank. I rarely see the cook time as an issue outside of teamfights, frequently the 65% slow is more then enough to grab a kill and folks screw up giving time to react off the cook. her R becomes increasingly reliable as an execute with items. Her early game damage is low but only in first 1-4 levels, a small fraction of game time. Also it spikes massively after 1-2 items then keeps getting stronger. I don't have issues with caster styles champions needing to wait around rotations, eves are on a pretty low CD.
150k is pre rework eve.
As far as win rates go, I think lb is dog shit bad but yet I have a high win rate with her.
Win rate is mainly based on skill level, not champion kit.
I don't get how youd invest 150K mastery on some one you hate. I can see you disliking aspects of their kit or feeling bad about things but I feel your title is either an exaggeration or your a pretty stubborn person lacking in self awareness. Its not like your struggling on her, you got more wins then losses, your Kda is fine, shes higher win rate for you then some of your other mains. Your call to keep playing her or not, I find her fun you claim you don't regardless I don't see much merit in the points your brought up, especially when you compare them with other assassin jungles.