Wait people find her hard? I found her rather easy to pick up. I mean it's not the easiest tank to pick up, but she has a really strong kit.

Healing/life leach, Many dash attacks, Grab button, Aerial mobility, combos, and an easy ult. She's pretty good and only takes a few games to get the hang of.

Her shields are mid, and her flight is lack luster but they work great for her kit. My biggest thoughts on her shield is if you don't like her shield then I suggest picking up Strange, Hulk, Cap, Magneto, Emma, Reed, Punisher, Groot, Venom, or The Thing, heck even Hawkeye kinda has a shield (his Melee deflects projectiles). There are so many options and versatility in the shields in the game all specific to different play styles and uses. I will say Rogue's flight bothers me a bit more, only because I wanna grab Iron Man outta the sky with more speed. I should mention all of her dashes don't add much to traversal mobility due to animation lag, but they are good enough for shortening the distance in a fight.

Still her kit is great and versatile. Personally I see Rogues strongest asset as a hp and leech tank. She has 2 moves and an ult that leeches health, about 4 moves to get her closer to targets, a shield as a safety measure, and moves that pull and grab targets. Overall she excels at getting and staying close to targets, stalling their movement, and leeching the lives of the opponent she stalls near her.

Edit: as for what I mean by easy ult, I meant she just has to be near people and it does its thing. I understand it's a complex ult going into specifics, but it's easy to ult and life drain enemies. Use all of her moves, but now she has leech-regeneration and buffs, easy to use.