http://ask.fm/Tom94/answer/128118253262Posting as requested - discussed with Staiain as well on what the ratings should be instead of what they are now.
Overrated maps:Miracle 5ympho X [Fullerene's Black Another] - Exemplary map that shows how much emphasis is put into max NPS in a certain period more than anything else. Aside from the transitioning between jumptrilling at 210 BPM (which is barely difficult, it's significantly easier than say Kamui - which is currently 4.86*) - there's nothing that's close to 5* in this map. Probably 4.5*?
Diva 1.2x [Insane] - The quadjacks in this are hard, but really not worth 7.75* or whatever it's rated at the moment. There isn't too much of a difference between jumpjacks and quadjacks at this speed - in fact quadjacks are arguably easier than jumpjacks because jumpjacks require different motions if they change chords whereas quadjacks is just one motion. Probably 5.4*.
AiAe [Wafles' SHD] - Very hard, but certainly doesn't deserve a 1.22* discrepancy between it and Haelequin. The hardest parts of this map are the quadstreams and the stamina component, rather than the walls (which is how AiAe is getting its difficulty). This is probably a 6-6.1* map, more than anything else.
M.A.M.A. [ExTra] - Generally easy up to the ending (which is a 1/8 jumpstream with a jump layered on every other note), which is the hardest part. However, M.A.M.A.'s ending could be easily manipulated as a 1/6 jumptrill. I know multiple people who can S this easily and they can't even come remotely close to S'ing anything that should be in the 6* range - this is probably closer to 5.6-5.7* than what it is at the moment. It is a very luck-based map, a person who can't even pass AiAe on command could potentially get an S on this.
Underrated maps:AiAe [SC] - This is a considerable boost from MX, but the difference between the two is only 0.21. SC has significantly harder patterning and layering - with tons of hidden one hand trilling and transitions with minijacks. It definitely deserves more than just a 4.60 rating - probably more towards 4.9 to 5.0 instead of whatever it is at the moment.
Imperishable Night 2006 [4K Insane] - Probably the most underrated 4K map that's currently ranked - 161 BPM 1/8 runningmen (essentially 322 BPM 1/4s) is something that's not doable for a good number of players. The leaderboards speak for themselves - the fact that the leaderboards look almost as bad as AiAe's should signify that it should be around the same level as AiAe, if not maybe lower due to the differences in scoring difficulty. Perhaps about 5.8?
Kamui [Insane] - Not so much demanding in terms of speed, but there's a lot of consistency demanded with tons of LNs that can't be released all that comfortably and long trills with chords layered onto them in an unorthodox manner. This tests a completely different type of consistency - so this might be harder to adjust in terms of difficulty. This is probably more towards 5.2-5.3, maybe higher.
The End [Keyboard Marathon] - 8 minutes of handstream and dense jumpstream at 200 BPM is significantly significantly harder than most maps at its given difficulty. It's certainly harder to score on than HAELEQUIN and
We Luv Lama [AAA]. We Luv Lama is mainly 210 BPM dense jumpstream with considerable breaks, whereas The End is far longer and has harder patterning (albeit shorter). This is probably closer to 5.6*.
Angelic Layer [4K Overjoy Stage 1] - The hardest part of this map is that it's insanely difficult to be able to jack on a single note consistently at 150 BPM. The fact that there are occasional notes layered on the same hand makes it harder to be consistent as well. I don't have many points of comparison because there aren't many maps like this, but 5.9* seems fine for something like this? It's not easy to rate this accurately because it tests consistency like Kamui AND it requires really good jacking ability.
The Scales of Struggle [Collab Extreme] - Lots of 400 BPM stream (and occasionally jumpstream) and a polyrhythm ending that is essentially a long 400 BPM stream and jumpstream after with difficult patterning. 6.16* might seem like a high rating, but no one has come close to 99ing this map, and there aren't many people who can S this - there are certainly more people who have the potential to S AiAe than Scales of Struggle. This is 6.5*, maybe 6.6*.
We Fucking Hate You [Masochist] - I picked this map because it has relatively low max NPS, but it's constantly difficult throughout. It's 220 BPM jumpstream with 1/6 bursts littered throughout the entire map, making it insanely difficult to both time and hit. 220 BPM dense jumpstream alone (there are some areas where it has a chord on every other note) is about 5.1*+, but combined with the fact that you have to juggle jumpstream with tons of 1/6 bursts with rigid patterning as well makes it absurdly stamina-draining. Probably closer to 5.5*.
There's a ton of maps that are underrated and overrated (and definitely some others that I missed out), but I mainly picked up examples of ones that should be bumped up or down so similar ones will follow suit. I also wanted to make a couple of graphs on how hard should a ___ BPM (chord)stream should be, given that ___% of the notes are part of anchor jacks or one hand trills present in them - but I haven't really thought of numbers yet.
Essentially maps with overly high NPS is overrated. Maps with a very noticeable stamina component or extremely fast streams (or any pattern with relatively low NPS) is underrated. Patterning and consistency required isn't taken very much into consideration as well, at least not as much as it should be.
Would like to know other maps that are overrated or underrated that I missed out, it would definitely help the devs out.