"One study compares three games of varying complexity. Measuring session duration, activity, and return rate from telemetry data for 45,000 players, it
finds that a tutorial does increase the return rate for the more complex game, but not for the two simpler ones [5]. In another study, the authors conduct a qualitative text analysis of hundreds of game reviews. They find that tutorials are generally very enjoyable, fun, and rewarding, but recommend developers to add elements of intrigue and more informational mechanics to help players determine that they should continue playing the game [28]"
Original Source
Source [5]
Source [28]
I'm not sure what the study design is, they appear to be firstly abour Ragnorak, WoW and Forza, then other studies of other study statistics, it's interesting though.
I would actually go along with @Eldraths reference to Rust, DayZ, ARK, and others in that genre, I've played all of those but not found them as in-depth in the way I like MO, I've never played Eve or WoW, so perhaps i have some cognitive bias here too
but to be fair the first study summary which appears to be a 'study of other studies' says "Our results suggest that investment in tutorials may not be justified for games with mechanics that can be discovered through experimentation."
i'd like to see a study with a fully designed spectrum covering community based vs game based instruction/help too,
I still hold that the 'discovery through experimentation' for MO in particular is king and everything from UI, interacctions and discovery in general should flow with more experimentation and less frustration, ie more consistency and intuitive design elements.
Short version - prioritise investment of time, money and real/virtual resources on great consistent and intuitive design and start in the main game environment with community content, also discoverable, i mean if you can't find discord or youtube or google 'MO2 gameplay' you're gonna have a lot of trouble anyway
-edit - i see reference to the MO Haven which has the old flagging system and grief aplenty, the faith in the new standing system should encourage both protection of new players and minimal griefing - having said that it will always happen somehow in any case