Most of the crossover CG movies in Neo, including the Cyclops Team attacking Torrington, Usso battling both the Frost Brothers at the same time, and the Wing Team fighting Master Asia (complete with him countering the Twin Buster Rifle with a Darkness Finger).
Mono-Eye/DS's characters had also some good arrangedversions versions of their themes.
Many Crowning Gundam themes are here as well, but World's OST stands out for being the only SD Gundam game to not include ANY opening themes, breaking the pattern and instead giving us the best of the OST songs.
Game-Breaker: The Gundam Double X with G-Falcon is this starting in Wars. Not to mention it's easy to level it up fast: just attack the mooks using the Twin Satellite Cannon that can aim up to 3 of them, and the last one gets killed, allowing you to repeat the tactic again until you run out of MP or Chance Steps. The same can be said for any Mobile Armor which can do the same trick the Gundam Double X with G-Falcon can do (like the Divinidad), as well as the Psyco Haro.
Some pilot skills count as this, such as "Cool-Headed" (reduces enemy suit defense when attacking without supports) and 0079 Amuro's exclusive White Devil skill (Boosts both attack and agility of any Gundam-type Mobile Suit... basically, all the good MS.)
God-Mode Sue: The Phoenix Gundam of is quite possibly the most powerful Mobile Suit in the entire Gundam multiverse. The Phoenix is pretty much a walking black box with no concrete origin, but abilities that seem to be gleaned from every Gundam universe that existed at the time turned Up to Eleven, like BFGs stronger than Wing Zero's and a Finishing Move more powerful than God Gundam's — and oh yes, it uses Nanomachines both for quick repair and to disable other MS' nanomachines, meaning it might be capable of taking down the mighty Turn A Gundam and Turn X, which are the watermark for absolute power in Gundam.
However, despite its fluff, in later games the Phoenix is only decent rather than extraordinary, especially after its nerf from World to Overworld with the removal of multi-hit weapons.
Nightmare Fuel: The banner for stage HELL-3 in Overworld has the Gundams of the heroes of each series featured in the game cloaked in crimson, staring down the viewer. Besides being the epitome of the dread instilled with what is known as the "Gundam rapeface" (see the general Nightmare Fuel page for the franchise as a whole), there's just something fundamentally wrong about the banner, mainly because those are the heroes' Gundams, ready to turn your team into scrap to destroy Earth, the direct antithesis to just about every single pilot of those suits. And unlike Balbadoro, which was running towards the Earth because Amelias was trying to seize control of the planet for her own ends, these Gundams are powered by the old Generation System and are thus pure, unadulterated malevolence.
The Scrappy: This varies per game depending on what the new series is, and what was cut out to replace it. Gundam AGE was seen as this for Overworld due to the lack of additions since G Generation 3D (which is considered a scrappy in its own right) and the amount of details removed from other series and causing various headscratchers in the process.
G Generation 3D: The whole game is widely considered a scrappy for having various scrappy mechanics, cutting out wide chunks of series (just like the DS days), and following up World, the end result were a great deal of unpleased fans, especially those that forked the money to buy a Japanese 3DS and the game (bear in mind this was during the 3DS's launch year, when the system - but especially for this subject, its Region Coding - had yet to be completely blown apart by the hacking community).
Crossdrive, due to its linear gameplay and the inability to save doomed characters from their fate unlike in Super Robot Wars or the handheld G Generation game.