Ranking RPGs just seems like a pointless endeavor. There are simply too many subgenres: traditional JRPGs, SRPGs, action RPGs, classic CRPGs, modern WRPGs, open world games with RPG elements, old school sandbox MMOs, modern themepark MMOs, etc. These games are so different that it is practically impossible to even compare them.
Beyond the impossibility of seriously comparing such disparate types of experiences, there is also the practical concern regarding those doing the ranking. These games are normally such involved time investments that who is actually qualified to have opinions on 100+ of them? How many people do you know, including yourself, that have actually sat down and played even the most celebrated games in all or most of the aforementioned subgenres? Even if you, like me, genuinely enjoy them all (most seem to have more selective preferences). For example, even though I love RPGs and have played games in all noteworthy subgenres, I have never played games such as
the Suikoden series
SMT games other than Persona
about half the Dragon Quest games
most Fire Emblems
the majority of the current crowd funded CRPGs revival
Fallout 1-2
Those are just off the top of my head. I have played a metric shit ton of RPGs in my life of all types, but I don't think that I could even come close to actually making a list of the "100 best" or whatever. Who the hell could?