As much as I wish..... no.
She is one of the slowest moving champs on the rift unless she has
, which are only good for engages but often stuck at followup once a fight starts.
Her ganks are completely voided by laners who don't know how to freeze lanes, yet somehow expect her to carry them.
Her group fight is lackluster, and eventually every game gets to group fights. Unless a 30% champ is leading the pack and thinking nothing of it, Eve is not going to do well in those situations.
Teams are notorious for NOT killing pink wards.
Evelynn's power spikes do not match up with game snowballs (When you are an Evelynn jungler, you often have laners feed 5-8 kills before she's even level 6-7. Evelynn engaging those laners at that point is not wise, because their output and sustain are greater.
What I don't think you realize is..... although Low elo League is plagued by disorganization, over time, the mechanical skill level of low elo players has risen. When a team NEEDS to, they do group, do ward, and are prepared for a champ like Evelynn ganking them. They may not ward at all or group at all in non Evelynn games, but it's always a seeming miracle when Evelynn is in play. They have their 5 pinks up, your team does not. They group. Your team tries to 2v5 that group, and then bishes at you.
A good Evelynn will always get a positive KDA.... but that doesn't mean they carry. That just means they put a few people on ress. She is not good at taking Barons, mediocre at Drake, horrible at lane pushes.
Once her team/Other team takes over jungle, she effectively stops gaining much gold. She can't beat an adc at clearing her jungle, or any aoe melee clearer for that matter. the setup to clear just takes too long. And in lane she has to take 2 second pauses just to reset E. So even if she managed 110 CS early game, the last 10-15 minutes of a game, she's lucky to get 30-40 more cs.
In other words, if she can't get CS..... and can't get kills because team grouping is superior for the other team, ..... she's going to lose.
This keeps her from being a low elo champ.
In High elo where people are more cautious and coordinating, she has a place. She plays into their dynamic. All she does in low Elo is pull off cheap tricks but usually not win.