* BrokenBase: Though it did sell well on the UsefulNotes/PlayStationPortable, and got plenty of positive reviews, fan reaction to the game is mixed.
* FanonDiscontinuity: Some fans pretend this game and it's sequel never happened. Of course, [[CanonDiscontinuity Insomniac themselves never mention the canon status of the games, no matter how many times people ask]].
* GoodBadBugs: The [[http://ratchet.wikia.com/wiki/Fire-Bomb_Armor Fire-Bomb Armor]] allows the player to shoot a fireball out of their wrench on the third swing of a combo. If the player kills enough enemies with it, the [[http://ratchet.wikia.com/wiki/Scorcher Scorcher]] will upgrade. If the player hasn't bought the Scorcher yet, they can now get it for free! [[note]]In the PSP version at least. We aren't sure about the [=PS2=] version.[[/note]]
* MoralEventHorizon: [[spoiler:Luna]] may have been a jerkass when we found out what it really is, but it crosses the line for good when [[spoiler:it tries to KILL the heroes with farming equipment]].
* PolishedPort: The PS2 version ZigZags this; on one hand, some glitches were fixed, but on the other hand, one cutscene was removed. So no matter which version you pick, it's a trade-off.
* {{Sequelitis}}: ''Size Matters'' is often criticized by fans for a weaker story, lots of {{narm}}, several GoodBadBugs, recycled plots, and for coming after the highly popular ''Up Your Arsenal''.
* ThatOneBoss: [[spoiler:Luna]]. It takes a long time to go down and her attacks are tough to avoid. And if you die, you have to go through the running-through-the-field sequence and cutscene ''again''.
* TheScrappy: [[spoiler:Luna and Otto are despised by the fanbase: Luna for being ThatOneBoss, and Otto for his narm and being a rehash of Chairman Drek]].
* WhatAnIdiot: It appears that Clank TookALevelInDumbass in the High Impact Games canon.
** First of all, Qwark reveals that he found his entire family tree on a site called "[=Faux Family.com=]", which Clank finds odd.\\
'''You'd Expect:''' That Clank tell Qwark that the website might be a fraud because of it's very suspicious name, or at least warn him that the site might not be 100% accurate.\\
'''Instead:''' He says nothing, allowing Qwark to reunite with who he thinks is his father.
** Second is when the little girl [[spoiler:begins to speak in the voice of an adult woman, commenting about her "friends"]]. Ratchet is very shocked at this.\\
'''You'd Expect:''' Clank to realize that the girl is actually [[spoiler:[[EvilAllAlong allied]] with their enemies]], and warns Ratchet that they must flee before something happens.\\
'''Instead:''' [[spoiler:He dismisses Ratchet's shock, and starts teaching Luna to talk properly. She zaps him unconscious, and both heroes are captured]].
** And finally, after destroying [[spoiler:the Luna puppet]] that had been antagonizing them for most of the game, Clank suggests that they get the coordinates for the final planet from it's database by hacking into it. Ratchet suspects that the technomites have a security program that could harm potential hackers.\\
'''You'd Expect:''' That Ratchet and Clank take [[spoiler:Luna]] to Metropolis to have Big Al hack it for them.\\
'''Instead:''' Clank decides to hack [[spoiler:Luna]] himself. As expected, a security program inside it causes him to malfunction.