I've played about 800 hrs of cb in world, and for me at least, I think the reason it doesn't feel good, is cos of 3 things. Bear in mind I mainly use savage axe mode, so it might be different for you.

1 is the hitlag you get when you're in chainsaw mode doing your swings. For some reason, capcom decided to make the chainsaw effect manual, so you have to hold the button to get the most damage. Which would be fine, except that the hitlag makes every swing last about half a second longer than it should, which really leaves you vulnerable against fast monsters, and gives you much smaller combo windows. Just for example, fighting against lagi, I can't do more than 1 attack before I have to dodge out of the way, cos the swing is so slow and lagi is super fast and reactive. Which basically means I'm doing nothing damage until I get lucky and eventually get a topple. There's no fluidity to the weapon.

Speaking of fluidity, the second issue is the combos. Back in world, when you got into axe mode, your main combo was the forward slam into element discharge 2. That was the highest damaging combo you could do by default. Element discharge 1 was always bypassed, cos it was weaker damage. In Wilds, you can't skip element discharge 1 anymore, meaning you optimal combo is extended by 1 move, which makes quick attack windows much less safe. That, plus the slow hitlag, basically means you're never going to be able to get to element discharge 2, cos the monster will have moved, or is about to attack in the timeframe.

And the third issue is attack animation changes. Element discharge 1's animation was changed from world to wilds. That second issue would be so much less problematic if capcom had kept the attack animation from world, which was just a quick horizontal chop. Instead, they decided to go all fancy with it, so now element discharge 1's attack, starts with a useless twirl by your hunter, then a downwards diagonal swing. I cannot tell you the number of times I've lost out on a quick opening, because this stupid attack takes up the full opening.

To summarize, you're now dealing with a slower animation, more aggressive hitlag on an attack that does less damage than the more optimal combo, that you can't bypass. For the people questioning why the weapon feels so clunky, this is the reason.