The grossout thing was always his personality in Japan. So it's not inaccurate either.
Theres a huge difference between picking your nose every now and then and farting 24/7. Wario being a bit gross was a small trait that only existed in some artwork and loves cracking gross jokes in a q&a, "Wario"ware took that small trait and stretched it out to ridiculous proportions.
The moveset takes more from his personality shown in WarioWare(the one he was supposed to have, as the US made him look differently from his original style) and Japan alone.
There's definitely moves from Wario Land that could be added, though. But getting rid of his canon personality is a matter of taste, but it's not like liberties were taken in that case. The moves, definitely. A lot of them. The personality? Not really.
The misconception that Wario was super gross in the jp version is also a gross exaggeration. The only differences between the west and jp portryals is the commercials. The west portrays Wario in a more sinister light while in the jp version hes portrayed as a goofy anti hero and rival to Mario. And the only examples of Wario being gross is a tiny fart joke in Wario Land 2's manual, a few poop stickers, and 6 questions revolving toilet humor in a q&a of 30 questions. His gross sense of humor was a small trait, all his other traits like his greed, his strenght, and egotistical nature eclipses that small trait.
There are major differences between Wario Land's and Warioware's portrayals of his character. Specifically his greed, strenght, weirdness, and grossness.
In Wario Land his greed pushed him into being a villain, to go on amazing treasure hunts, and participate in exciting sport events. In Warioware its used to make quick time, repetitive microgames involving ****posts and toilet humor.
In Wario Land he has Herculean strenght. He beats down hordes of monsters, piledrives enemies bigger than him, and works out routinely etc. Warioware threw all of that out the window and now he cant even lift up a golden toilet.
In Wario Land he has zany tranformations and hilarious expressions. The weirdness in Warioware are just random ****posts.
In Wario Land his grossness only existed in some artwork where he lazes around after a hard day of work and cracks a few gross jokes, Warioware butchered him into a lazy slob who sleeps all day, eats unhealthy snacks, and farts 24/7.
Wario was a well rounded and fleshed out character with plenty of well written traits in the Wario Land days. Warioware has NONE of the traits nor charm Wario Land had, hes nothing but a gross carciture. All Warioware did was stretch 2 small traits ( being gross and lazy ) to ridiculous proportions to the point where those are his only traits.