I know when I am in mortal sin and when I am genuinely sorry for my sins.
I’ve never had a priest evaluate me on the level of my contriteness. They’ve always been happy to hear me recite the act of contrition by rote.
I rarely receive a stringent penance, even when the sin was a serious matter. So, how is that more efficacious when a priest hears my mortal sin, tells me to say one Hail Mary, mutters through the prayer of absolution and tells me to say my act of contrition in the pew?
I’m assuming you don’t confess things you’re not truly sorry for. Most people don’t, since it’s voluntary, and priests know this. So in that sense, yes, they evaluate you.
Some people, however, are not like yourself. Imagine a child forced by their parents to go but really thinks they’ve done nothing wrong. Or someone in an illicit relationship who, upon questioning, has no intent of giving up said relationship. And yes, priests do ask, I know I have been asked sometimes!
The truth is, if you confess properly and sincerely it benefits you regardless of the priest.
You’re enumerating by number and kind your own sins to a man who is a fellow sinner, and sometimes a complete stranger. Hopefully you’re not sugarcoating or omitting anything. That alone is a truly humbling experience. And I suspect that may be (partly) why you’re trying to find reasons not to do it - I know I find reasons to put off confession too at times.
Secondly - if you say you’re sorry and intend to, with God’s grace, avoid future sin, without meaning it - what kind of confession is that? The whole point is to mean what you say. If you don’t mean what you say you’re not fooling God even if you may fool the priest (he being human) and may as well not have done it.
Confession is like Mass itself - some people attend merely to go through the motions and don’t enter into the spirit of the thing. To do so does indeed render it a meaningless exercise.
If one DOES put more effort, thought, preparation and so on into either Confession or Mass one gets a lot OUT of them. Even (I can tell you this from my own experience) with an ordinary or substandard priest.