Awesome Music: The soundtrack for Neo and RMX is an excellent assortment of fast-paced electronic music by Shin'en's sound team. You can purchase it digitally here.
Complacent Gaming Syndrome: In RMX in particular, online players will use Mueller or Bliss due to being strong Jacks-of-All-Stats, or Rochdale due to having the best acceleration in the game coupled with excellent cornering. Spaarc is used by top players in Time Attack on Supersonic and Hypersonic; with the best Boost in the game, it's able to punch its way to high speeds and stay that way, but less-used in online play due to not being well-suited for Subsonic, which is the only mode available online.
Demonic Spiders: The crawler mechs on Iceland that walk across the cylinders, and the giant crawler mechs on Kamagori City. Both are an instant crash if rammed into. On Hero Mode, that's an instant loss.
Ear Worm: The music for Sendai Outpost is irritatingly catchy, owing to being the only track in NEO and RMX to run in 12/8 "swing" time rather than the conventional 4/4.
Friendly Fandoms: A lot of fans of the game are basically F-Zero refugees, due to that series not having had a new game in about 15 years.
In League, the announcer's "You are x seconds ahead/behind!" wouldn't be this if it didn't happen every few seconds. Thankfully, this is not present in the HD games.
From Hero Mode: (CRASH!) "Please try again!" Expect to hear both in succession a lot as you try to clear each course.
In a similar vein, on Time Attack mode: "AWWWW!" "Please try again!"
Paranoia Fuel: Hero Mode is basically Paranoia Fuel: The Racing Game. You need to place 1st to complete a course, but you have to be careful of obstacles, especially ones that move (such as the crates in Mueller Pacific and the crawler mechs in Iceland) or intermittently pop up (such as the lasers in both "Habitat" courses), because you're on a Life Meter and a crash instantly wipes the entire lifebar out for an instant Game Over.
Polished Port: FAST RMX has most of what FAST Racing Neo has to offer, with the added bonuses of being portable and wireless local multiplayer.
In online multiplayer, you can't switch machines without leaving the session entirely.
Choosing the "friend" option for online play does not let you pick which friend to play with, which is problematic if several people on your friends list are currently playing online and you want to race with a specific friend.
Spiritual Adaptation: Given that Nintendo has been waffling on a new F-Zero game after F-Zero Climax, many players feel that this is the closest to a new F-Zero game they will get. The phase-shifting mechanic has drawn comparisons to Ikaruga as well.
Iceland in Neo and RMX. It's F-Zero's Cylinder tracks, but with a bunch of crawler mechs and barriers on the track out to kill you when you can just barely see them. Have fun beating it on Hero Mode!
Kamagori City also has mechs that can easily terminate a Hero Mode attempt, and the placement of the mechs' legs change with every lap. In addition, it has an unusually fast Time Attack target time on Hypersonic.
Caldera Post is long, taking the most time to complete out of any course (roughly three and a half minutes on Subsonic), and featuring jumps that can lead you into boost orbs (which award more boost if collected while in mid-air) but also involve tricky maneuvers to avoid crashing into bridges.
Tier-Induced Scrappy: Zvil in the HD games has the highest top speed, but it's far outweighed by the fact that it loses way too much speed from turning. It doesn't help that it has very low acceleration and boost parameters. It was likely intended to be a Difficult, but Awesome machine, but it just ends up being Awesome, but Impractical.
Underused Game Mechanic: Neo got an update to allow Supersonic and Hypersonic in online modes, but for whatever reason, RMX did not get the same feature, limiting online play to Subsonic. So if you wanna race with a top speed of more than roughly 750 mph, you're gonna have to dust off the Wii U.