I've finished the game. Level 174, 204 hours. What a ride, I started in late February, played slowly to avoid burnout, and here I am, almost 6 months later.
Final boss was a massive disappointed, unfortunately. It looked cool, and that's about it - you run around like an idiot hoping to get few hits in, horrible fight for a pure melee character. And I feel the final success rate is strongly dependent on RNG involved in whether it will decide to stay in place and allow you to hit it, or keep flying around and nuking you from afar. I think Godfrey would be a better fit for a final boss, especially considering his second phase. Or maybe make Radagon harder / faster / more aggressive and give him phase 2, not sure.
Hardest bosses for me (no player summons, no ashes, no cheese strategies):
1. Malenia - was not able to beat her solo so far
2. Mohg - 30 tries
3. Final Boss - 10-15 tries
4. Fire Giant / Draconic Sentinel / Margit on early level - 10+ tries
Best / most fun bosses:
1. Maliketh
2. Godfrey
3. Commander Niall
4. Margit
Will probably start as a sorcerer soon, lol.
Very good game overall, but not perfect:
- I played the whole game with like 5 weapons (battle axe, great axe, large club, guts / grafted swords) due to upgrade system limitations. There is no logical reason to force you to upgrade using 2 -> 4 -> 6 stones, 1 -> 2 -> 3 wouldn't break anything but allow for much more freedom. Or maybe even allow to re-use upgrade materials and let you experiment?
- open world was sometimes boring; the biggest offender for me was probably Liurnia after finishing Stormveil. If I didn't play slowly, I would probably burn out at this point
- recycled assets and bosses; partially excused due to size of the game
8.5/10 overall. I liked the game more than Dark Souls 2 (but this shouldn't be a surprise) and Dark Souls 3. Demon Souls had better atmosphere and it was a more 'tight' experience, but I think I liked ER more as well. Not sure about Bloodborne, probably it's a close match. First Dark Souls still stays the best for me, masterpiece.