At the time of writing this, Gwen is the newest Champion in the game, so people are still figuring her out, including myself. What I've discovered is that she's more of a specialist bruiser, like Camille, Wukong, and Irelia for a few examples. By this I mean she can't just jump on her opponent practically whenever she wants to and expect to win, like Darius and Renekton often can. Instead she needs to look for short trades repeatedly until her opponent is low enough to finish off with an all-in, and set up certain conditions for herself by stacking her Q and activating her second and third ult.

I titled this guide "Float like a Butterfly, Sting like a Bee" because that's how I've had the most success with her. You go in with a stacked or nearly stacked Q, get in some autos and that Q, then back off, rinse and repeat. Even when you do this, she can still struggle in 1v1s, though. She really comes alive during team fights, at least in my experience so far. I don't mean she has good team fight utility, which reminds me, her W doesn't protect her allies when they're inside it, or provide them with any benefits for that matter, only herself. This is good for both you and your teammates to know before they try jumping in to survive a Lux ult.

Gwen is quite frail, and her damage doesn't typically make up for her frailty. She does still deal good damage, however, so you can put in a lot of work when your teammates are able to take attention away from you. For this reason, Gwen will likely fit best on heavy CC teams, specifically CC that prevents the enemies from attacking you, like stuns, charms, and taunts.