I like to engage, to a point, it gets tiresome if every game does that constantly. But the harder it is the more important it is that the bosses are well made.
In Kena, there are a lot of things I find have issues when they do bosses. For example, the red shit they put on the ground you can walk over and lose health, sometimes you run around trying to survive and can stumble into it. Or sometimes they have some of the battlefields are so large that you intuitively feel you can run around and be safe if you feel things are hectic, but the bosses usually got attacks that can get to you no matter. The dodge isn't as accurate and fast as it needs to be, and some of the rot attacks are not responsive enough (if you press too fast it won't activate at times). There are also several bosses that spawn mobs, and dealing with mobs and bosses at the same time is usually frustrating.
Add to that, they have 3 small bosses leading up to the third boss, and while these 3 bosses aren't that hard, they leave you very little space to do what I feel Kena does best, namely exploration.
Cuphead or FromSoftware games are miles ahead with boss design IMO. Metroid Dread is on another planet. I generally like Kena, but I think the game would be substantially better if they designed the bosses differently.
And, I find that almost everyone seems to have a positive outlook on hard bosses once they clear them. But during the process, people won't admit to the issues because they don't wanna feel like a bitch. Kena's bosses reminded me of some of Lord of the Fallen's bosses, sure they are hard, but they are subpar and can get tiresome. In my opinion.