Wizard's soul introduces itself like a casual slice of life would and, in a lot of ways, it felt pretty similar to Bonnouji. As someone who enjoyed it a lot, I'd feel familiar with this style and pacing. I liked the firsthand concept of trying to lead a romance in a world dominated by a trading card game.
However I wasn't so much of a fan of the very sudden switch of focus from the slice of life to romance aspect into a tournament which covers almost the entirety of the manga. Since it was not introduced as the main plot at first, it came as a surprise and as something I wasn't reading the manga for at the time. I did enjoy the tournament, but I don't feel like the manga really tried to pull the readers into it.
There are some things I believe it's lacking to be a "card battling manga". For instance, the TCG scene is not really detailed enough to be the main focus of the story and I think it is mostly a reference to Magic The Gathering, with different names for cards. The stacks are also rather poor, they're just quickly established in one chapter but the main girl's motivation honestly isn't solid enough to run a whole manga. Also, the tournament is just way too long and it's one fight after another without a break, a real change of situation (aside from some small events that don't have any impact on the outcome) or character development. Battling mangas usually try to pace this by taking a break in-between events, and notably introducing different reasons for a battle: rather than being one continuous tournament, you'd show one or two battle for each arc and then make the story progress. Since there's only one arc, it felt really heavy and draining to read. The characters were also never introduced outside of their match, and I honestly only cared for the initial cast when the card rivals started appearing as friends, after their respective matches.
It's still pretty good, the main character is cool and the fights, although tiresome to read in a row, are interesting. Bonnouji's author is solid, but I wasn't really a fan of this work.