>>150201390 (OP)
The Absolute Solver is indeed an excellent villain, a testament to that is how the Solver steals every scene it's in.
>>150215592
The Solver wasn't wasted at all. If you don't like protagonists winning through a seemingly hopeless situation, then don't watch anything... ever.
At least the path to "victory" (quotes because The Solver hasn't actually been defeated like you're implying, just held back and contained in Uzi meaning it can just resume what it's doing if Uzi gives up or ever kicks the bucket) makes sense in Murder Drones.
Uzi struggles with the Solver possessing her for the final 3 episodes of the show, and eventually manages to break through the possession due to the help of N in Episode 7. Which leads to the continued struggle of trying not to be possessed in Episode 8, using N as an anchor to stay herself, and eventually rejecting possession alltogether to try and fight back against Cyn directly.
And even then Uzi, N and V STILL can't actually overpower Cyn even while The Solver is blatantly fucking around. The Solver is an eldritch horror that fucks around and enjoys this, that's part of the whole point. The only reason Uzi gets her hands on Cyn's core is because she remembers Cyn teleporting behind her earlier, and when Cyn teleports Uzi outsmarts the Solver by turning around and placing her hand where Cyn is materializing.
None of this is "wasted" to me. Especially since The Solver is still.. you know, there. It's not like they can actually get rid of it.