Are there any comprehensive & reliable lists of masternode coins? No inflated ROIs, etc
I think the best tools to check all masternodecoins and compare them in one place are:
https://masternodes.pro/https://masternodes.online/Two very good services which provide all the info you asked for.
This is a great question because this is the main problem with masternodecoins, after the period of profitability which is from 1 to 5 years, but mainly not more as 3, they just going to be inflated and finally the price is going down. If there is no additional value in the project like anonymous transfers or features inside the wallet like chat or something then with no use is no value and after high POS profitability period, all these projects just become death zones.
these resources are collection of scam projects) they don't care about the code and list any shit that pays their listing fee. want to check a project - go to github, not damn cmc or mnranks

if you can not compare projects on github - you better learn or just burn your money)
ps check the github of the coin that is in the footer of mnrank - nice example of overall picture