Going from least favorites to favorites:
Commodore 64 (Games System): no swag
Educational consoles because dear god do these all look awful except maybe the Leapster
Leapster: hey didn't say I'd place it high
Astrocade: a little more swag
Dragon32: this is just a block. You use these to throw at windows, not play games
SG-100: see Dragon32
IBM: see Dragon32 and SG-1000
Microvision: RING RING RING RING RING RING PHONE CALL PHONE CALL
TI-99: I see why they went back to making calculators
Fairchild: just a worse looking floppy disk
Atari Lynx: this is a cartridge? Looks more like that thing directors clap down when they want a performance to do, "Lights, camera, action" looking ass
Grandstand Game Player: "what the hell was that?"
Vic 20: Vic 20
Bridge Companion: reminds me of a toll booth, so I hate it
Master System: I HATE THE WAY YOU WALK THE WAY THAT YOU TALK
Aquarius: That ain't a cartridge, that's a vaccuum cleaner
RCA: This existed all right
Turbografx/TurboExpress: Uncommon PC Engine L cause what the fuck is THIS
Supergrafx: holographs are cool, but it results in the cartridges looking bland, all 5 of them

Wonderswan: meh
Wonderswan Color: just a little less meh for the transparency
Vectrex: very odd
Evercade: 3DS cartridges if they were made at the local Dollar Tree
3DS: I can't be the only one to think 3DS cartridges look ugly right? The non-transparent white, the weird bump at the end, ew
Game Boy: same issues as 3DS
ZX Spectrum: EW
5200: It's alright. That's all, alright.
Colecovision: it's also alright
GBC: Far better but still has the ugly bump
Pokemon Mini: this existed? Also it looks bland, unique though.
PV-1000: eh
VC-4000: eh
Jaguar: this shit look goofy as fuck, but I'm giving it points for the uniqueness
Commodore 16: why does it look like it's bending lmaoooo
Loopy: Simple but it looks like the end of a toaster oven
Game Gear: why is it so rounded lmao
Coleco Telestar Arcade: A triangle is so uncanny to look at but the fact that that's the case makes me give points, even if in the middle
HuCard: not bad looking
ProSystem: Looks more like you'd install it upside down but you know what, it's not bad
MVS: I like the transparency
400: very odd
Electron: 50/50
Commodore 64: simple, yet bland
Rowtron: dunno how to feel
2600: The classic. Looks like a tiny DVD
7800: smaller 2600
Switch: lower than the DS because they are TINY. Other than that, has all the pros of DS
DS: Simple, small, kinda cute
Mega Drive: It's unique looking and I like how the game title extends to the top, which would make it a little harder to lose
MSX: it's like a more streamlined MD cartridge
GX4000: They're better looking DS cartridges, and that's neat
N64: It's kinda funny how similar to the 32X this looks
32X: cooler looking Game Gear cartridges that are a little less rounded
Sega Mark III: MIGHT go kinda hard
Magnavox: good kind of weird
Voltmace: looks wooden, like something at the Cracker Barrel
NES: always liked how this looked like the type of skyscrapers from the Mega Man 2 opening
GBA: never owned one but always thought the cartridges looked ?
Virtual Boy: so today I learned this had cartridges and I'm ngl, they go kinda hard
Game Com: damn I kinda like this one too
Arcadia: aaaaaa it's so cute
SNES: a little weird to look at after the NA cartridges but, kinda cool.
SNES (NA): I like the way these look and I can't describe why
Famicom: damn, this is what we missed out on?
Supersystem: This odd looking cartridge has won my heart
Neo Geo AES: this cartridge looks swanky
Super Cassette: looks the most like a toy, I kinda like that
Super Lady Cassette: Ain't never heard about this console in my LIFE, but I love the way this cartridge looks
MPU-1000: ooh, it actually sticks to looking like silver and looks like extra box art with directions too
Tandy: It's unremarkable but you know what, the art at the front rather than just a game name puts it higher up
Neo Geo Pocket: could this be it? Could this be my favourite cartridge?