I think most reviews already told what I think about MineClone; it basically deserves its 1st place in Best Games on CDB. Right what every new player wants from Minetest: a Minecraft clone, (almost) perfectly 1-to-1. And besides that, developers do a great job at making their game open for various modders (including me!), and almost everything you could need to access from here is either properly documented, or obvious from the code itself. And if not, there's a huge community of them, you can ask them whenever you want to!
I'd definitely give MineClone 2 a solid 11/10. If you're still in doubt, just download this game and play it yourself. Even if you won't like it, it's a great example to what default MTG could be if Minetest decided to stick to the MC-clone paradigm.
It goes without saying that MTG and Minetest shouldn't have to try doing what MineClone2 does. A lot of Minecraft players use some kind of mods, so there's obviously interest for more than what Minecraft has to offer. It's hard to say when we'll reach feature parity, or get close enough, but even we want to offer more than the vanilla Minecraft experience. For now, that's a low priority side project that will become a modpack.
With a small team it's just impossible to pay attention to everything in short term - performance, stability, features, multiplayer, modding, documentation, translations, etc. But constant work will keep things moving in the right direction. And with help from new contributors we'll be able to improve faster.