These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ascended Fanon: Possibly, as there was a LOT of fan fiction depicting Griff as the arrogant jerk portrayed in SSX 2012, even before On Tour's release
Broken Base: The Deadly Descents in SXX 2013. Whiel some critics didn't like them, others like IGN called them the highlight of the game.
Crowning Moment of Awesome: Griff bails on the team and sets up his own. How does Zoey react? She heads to where he set a trick record and at the start of the event does something not even James Bond would attempt and grinds a helicopter. You heard right, she grinds a helicopter in flight, bagging two million points to Griff's two thousand in the opening seconds and ending with nearly five million at the end.
Crowning Music of Awesome: These games have TONS of it, mainly in the form of funky or just plain adrenaline-pumping electronica. On Tour didn't use that kind of music too much, though the soundtrack is good in its own right.
Dork Age: A fairly minor one. The fanbase may disagree as to whether or not Tricky or 3 was the best game, but it's generally agreed that, starting with On Tour, the series, while still good, started to get stale. As of SSX 2012, it's firmly out of this.
Ensemble Darkhorse: Psymon is the only new character from Tricky to reappear in the later games.
Eddie was also popular enough to get back into action for SSX 2012.
HSQ: "... damn, did you see how many flips he just got in there? What was it, five? Six?"
Grinding an airborne helicopter. Do this and you've won and have enough points for every trick event in the game.
Scrappy Level: The Deadly Descents in SSX 2012. Each one is packed with common snowboarding hazards (trees, ice, whiteouts, rocks, etc) which makes getting down the mountain a hugely frustrating affair. Several game reviewers note that these tracks drag the game down, but others have said they're the highlight.
Scrappy Mechanic: The rewind button/chasms in SSX 2012. No other SSX game had these.
Shipping: Seriously. The second game added a Relationship Value system where each character had friends and enemies, which fueled the shipping. Mac/Kaori and Zoe/Moby are two of the more popular couples.