Finished Vampyr. It is mostly fine, though, there are issues. In Chapter 5 (out of 6), I found a police officer, but was unable to report the previously-met serial killer, gang leaders, the child abuser, or the poisoner. The only way to anyhow prevent them from causing harm to random people was to lethally bite them, which would result in a worse ending. From what I've read (haven't tried myself), killing or not killing civilians is the only way of interaction with them - quests do give XP, but the NPC's state does not seem to change, while, for example, if the serial killer is killed, his mother adopts the homeless orphan. Additionally, as mentioned, slaughtering the nameless vampire hunters was perfectly fine and did not affect the endings or the MC's appearance (again, haven't tried myself, but the more civilians are eaten, the redder the MC's eyes become).
In terms of combat, while most of the regular opponents were possible to interrupt with normal attacks (thus, just hitting them until the stamina ran out was a viable strategy), it only partially worked with the bosses, though the later ones resisted the interruptions with normal attacks (the abilities mostly worked). The targeting was somehow odd - sometimes, the opponents could glide several meters forward while also changing directions mid-swing, sometimes, the attacks worked like they would in Dark Souls. On a positive note, I quite liked the second form of the final boss, easy may it be, - the boss was impossible to bite (so, no healing in combat) or interrupt, but the boss' damage was low and attacks clearly telegraphed, so it was defeated on the first attempt (the first stage took several, because I counted on being able to stagger the boss and did not notice how much damage the stacking poison clouds were doing).
The ending was funny, partially, because the information told by the NPCs was presented in a diary found 2 minutes before the dialogue. I also found the best sword (by accidentally seeing it mentioned on the forums and having the collectible required to solve the puzzle leading to it) and water for the plant at the MC's office (that one I almost missed). I did not rest after the Chapter 5 boss battle, because I was worried that the districts' condition might worsen and did not have enough XP to level up. Another thing I noticed is that one of the Irish NPCs was using the American date format for his diary, mm/dd/yy, instead of dd/mm/yy.
Overall, while Vampyr was not anyhow close to VtMB, it was playable. Considering that I still have the manual saves created via Windows Explorer, I might try to see what happens if more people are bitten.