As an "RPG" game, it's a great open world with a lot of beauty to explore and amazing lore.
As an "action" game, I don't think it's that interesting.
If your looking for good combat try Sekiro.
Anyways,

Rather than being careless and just swinging or whatever, you can defeat the bosses by memorizing their attacks and focus on improving your roll timing.

However, i do feel like some bosses can really be a struggle without the right build.
But that's where the issue starts.
The game depends on your build and what weapons you use.
And that could cause the game to be a little "easy" or rather boring for some, unless your into that kind of gameplay.
Or you can keep telling yourself that you can win no matter what. Personally that's when I feel like the game becomes fun and rewarding.

Elden Ring doesn't hold your hand. the game trusts you and everything depends on you.

And for keyboard and mouse, The camera, lock-on, and other basic action systems aren't that great and can be really frustrating especially when fighting multiple enemy's or when it makes you fall off a cliff with Torrent.. (speaking out of experience)

The lore, characters, and world building had me hooked up with this game, it's a great experience too.

If i would be able to use a controller then i'd give this game a 10/10~