Well, it's called WarioWare, but really, it's as much a "Wario game" as it is a Mona game, or Jimmy T. game.
I think Mario Kart is more of a Mario game than WarioWare is a Wario game.
In Mario Kart you can play as the title character for the entirety. Wario's role is limited to being a host for tutorials and final stages.
He does appear, but so do a myriad of other characters, including Mario. At any rate, I see no problem in calling WarioWare a Wario game, but it's definitely not one in the sense of priority or playability.
Deal with it? I'm not trying to deflate anyone's love for WarioWare, @CM30, I'm trying to have a healthy discussion, because this was an extremely relevant question for Wario players back in 2003.
It's true that Wario became the *face* of the product, but he definitely wasn't the reason it was created. Mario Artist on N64 was the original host, for those still unaware... https://www.youtube.com/watch?v=A-UYOl5xjlg
But he had more games with microgames, and he's the current host. He's only a game developer so he can make money. He'd do anything else if it made him money. That's just like Wario.
Yeah, but that was the issue. Wario's role is limited to a shallow backstory. Any old character could host those microgames and it would play the same (as it did with Mario Artist).
Here's a quick little story, to explain my point to you good people...
Back in 2003-2006, when the WarioWare games first came out, I let all kinds of people try 'em out for a laugh. At high school, at family gatherings, parties and holidays, you name it...
Their response was always the same. They loved the microgames, but complained about the "time-wasting cutscenes" and random characters taking the spotlight away from Wario... "Where's Wario?" "Who are these losers?" "What's all this got to do with Wario?"
They'd ask why it was called "WarioWare", and that always bothered me.
Apart from two small cutscenes per game, and his likeness showing up in some microgames, he never served in any prominent use or capacity. So you can see why I've met this conclusion over the years, having grown up in the 90's with Wario's wild adventures.
It's like putting Scrooge McDuck in the role of an occasional narrator or "brand", rather than the active focus of his supposed comics.