Regarding Monero, while the price has been somewhat weak over a two year period (as you say, whatever the reason, there was certainly an unsustainable pump early on), the market cap is now well into the all-time-high zone. That is not something you see much (if ever) with two-year-old coins, other than Bitcoin.

I just clicked through every single older coin in the top 10 (ignoring the unseasoned ones such as Ethereum, Factom and Maidsafe). Not a single one other than Monero is anywhere near its market cap peak.

The same applies to all of the top 20, with the exception of FedoraCoin (TIPS) which has had an insane pump recently. What is going on there?