Minetest is horribly presented. It's appalling how bad, and it's pretty obvious too. Goes to show that we software developers might have technical prowess but can't run things that take soft skills for shit (I am assuming it's people on the development team making these decisions, I might be wrong.)
I see people throwing around the old "It's a game engine, not a full game! It's about freedom! People are just not using it right! They must use the mods!". This is all nice and dandy and pretty cool actually, but the entire thing is handled hilariously badly. Here is how 99% of people are introduced to Minetest:
1) They hear about it somewhere and get interested.
2) They Google it and find the official website, which they enter.
3) They see the "Download" link on the top of the page, and click it.
4) They download the game as it is presented to them, in the form of Minecraft_game (here is how it goes wrong).
5) They realize the game is boring as hell and quickly lose interest.
The first experience people have with the game is terrible because the most likely path they will take to install the game gets them to a naked, boring game. The freedom to mod is great but presenting people with the naked game and expecting them to do the leg work to turn it into an enjoyable thing is incredibly stupid. People won't spend time reading wikis and forums to make sure they are playing the game how it's "supposed to be played". They might get into the paradigm of modding and all that shit after they got a taste of a polished, fun game, not before. I'm sure you lose thousands of potential players because of this, and worse, probably a few potential contributors to the project as well.
In my opinion, the "Download" page should be re-designed in a way that encourages the users to download a full version of the game. The very first piece of text should be a very brief and to-the-point explanation of what Minetest actually is and why they should not download the vanilla version and present them with fun alternatives. Minetest_game should be at the bottom of the page, still easily available, but only to people specifically looking for it.
Game or game engine, call it whatever you want, it's ultimately a piece of software that's supposed to provide entertainment and you make sure that the most likely first experience of most users is not fun at all. This is just not smart.
People on open source projects tend to think they know it better though so I expect it to stay this way, which is pretty sad, I really like Minetest and would like to see it turn into something bigger, but it won't happen until people in charge realize that quality code and features are not everything you need.