We have to compare Kakashi during the whole manga to know how he's evoluting.
Zabuza :
-hardly used sharingan
-2 suiton jutsu
-1 raikiri
and he was exhausted
Kakuzu & Hidan
-5 raikiri
-1 suiton
-1 summoning
-said that he had enough chakra to use kamui
Pein
-4 raikiri
-2 doton
-1 lighting clone
-1 raiju hashiri
-2 kamui
Swordmens & Tobi & Bijuus :
he did certainly much more than we saw, as you know,kishi didn't detail the fight against swordmens,so we just saw :
-3 raikiri
-lighting Kubikiribōchō
-1 kage bunshin which split chakra in 2
-1 raiden
- was going to use kamui.
Not to mention that Kakashi and gai are fighting since 2 days in multiple fields, while others division finished to defeat their enemies.
If you look carefully all these fights,kakashi's always getting better after each fight and fighting always more powerfull ninjas.
It's to early to say that Kakashi will not getting better since the manga shows that after each fight he's getting stronger.
Kakashi was supposed to have a single fault and full of qualities. His only fault was his low chakra.Well here we are witnessing a Kakashi fighting since 2 days on high level.
Now I don't dare to make any prediction about him. Clearly, Kishi was the right one.
I think that he didn't reach his prime yet, he has a big potential.