YMMV / Marcel Vos

• Broken Base: Marcel's strategy of using Micro Coasters has actually caused a bit of a rift in the fanbase. Some consider them very small and economical, while some call it cheating or too unrealistic (as nobody would actually consider riding them in real life). Marcel himself goes into detail about why he uses them in the linked video, acknowledging that they're a Game-Breaker and saying you can't really say you've beaten a scenario if you can't win without them, but if you've already played the game in the intended way, he considers them useful when either deliberately pushing game mechanics to their limits or to allow more money for building aesthetically nicer park.
• Common Knowledge: Many people assume an in-game year is an hour, but in a video, he actually confirms it's 54 minutes and 36.8 seconds. Additionally, every single month takes the same exact time to elapse. April, June and September (which all have 30 days) take just as long as the other months.
• Complacent Gaming Syndrome: His (in)famous tiny Corkscrew Coasters, as described here. He normally builds these in parks for either an easy cash grab (where you get money from rides) or easy guest attraction (each one attracts about 100 guests organically), and many of his followers have followed suit too. Basically it's a Powered Launch Corkscrew Coaster with a half corkscrew and the slowest launch speed possible. The train won't make it all the way past the corkscrew, but will still be a somewhat viable ride, especially in higher amounts.
• Memetic Mutation:
  • "Hello everyone ..."
  • Hating on the Heartline Twister Coaster, which often happens even in videos that have nothing to do with the coaster. He even admits that it's a "meme ride" and that OpenRCT2 shouldn't try to buff it. (Ironically, his videos raised awareness of the Heartline's suckiness to the point where Open did buff it... slightly. It's still one of the worst coasters even post-buff, which Marcel acknowledged.)
• Schizophrenic Difficulty: Discusses how he feels like the first game's learning curve was a really good one, considering the levels subtly introduce you to something new. He also criticizes the second game's curve for being poorly organized, seeing how a park like "Crazy Castle" is the first park (which throws you a park that's pretty straightforward, but has a few issues that a beginner might be confused with, including getting 1500 guests in four years and the paths being too spread out), despite the fact that "Electric Fields" should be the first scenario (which is a bit smaller and has a smaller guest requirement, but still isn't quite beginner friendly). And that's not before getting to Amity Airfields (3000 guests in four years with only having flying-themed rides), which due to the alphabetical order of the scenarios, is listed as the first level of the Challenging Parks category, where it should've been much much later.
• Low-Tier Letdown:
  • He personally despises the Hyper Coaster, considering it to be an inferior version of the Hyper Twister Coaster and that he prefers the Twister or Giga versions. He even made a comment on how it's considered his least favorite coaster type in the game. However, he doesn't consider it the worst coaster in the game, as in a tier list video he made, he considers it "okay".
  In sum, I'm not mad, just disappointed.
  • He also considers Security Guards and Entertainers to be situational at best. For Security Guards, he considers them pointless because Handymen could do their job by keeping paths clean at all times (as dirty paths lead to vandalism to begin with) while as for Entertainers, he feels as a park should be maintained properly instead of hiring entertainers to begin with (i.e. shortening queue lines, cleaning up vandalism, and such), though in the situation they're useful for — keeping guests happy in terrible parks that lack basic necessities, which is often the case for Self-Imposed Challenge runs with absurdly strict restrictions — they excel.
  • The Heartline Twister probably gets this the worst, due to its downright awful stats.