I'm calling it now: Once Colosseum/XD release on NSO, their reputation will see a steep decline over the following years, especially the former. So much of Orre's acclaim and legacy is built on being "The secret 3D Pokemon classic Nintendo doesn't want you to play" which has generated a bubble of mystique that's soon to be popped. We call this "Sonic CD syndrome"
If there's ever a spinoff that I think
desperately needs a remake to smooth out the rough edges, it's Pokemon Colosseum.
What you have to pick from is a pool of 50% meme mons and 50% okay mons - not a good look in a game with roughly 50 options. Very occasionally you'll get a "holy crap this is amazing mon" like Furret or Meditite that generally went overlooked in their respective games but it's few and far between. Contrast this to XD, where almost every Pokemon in that game has something to offer to set it apart (though it does come at the expense of half the roster being locked to Citadark, unfortunately). A good example of this would be how Gulpin is your only real Toxic user unless you're lucky enough to roll Surskit and trade for Shuckle given TM06's Orre Colosseum / postgame status. XD has dud mons too (Mawile and Trapinch come to mind) but they are nowhere near as common as Colosseum's underwhelming roster.
A prime example of how awkward Colosseum mons are is Qwilfish. On paper, putting Qwilfish in a game like Colosseum is a great idea. Without stuff like Starmie or Lapras or Tentacruel and the like to make it basically obsolete, Qwilfish
should shine. But it not only has the objectively weakest Surf of all the Water types, it doesn't even get Sludge Bomb until the last 5% of the game (good luck beating Under Colosseum with their high levels).
Another great example is Sudowoodo. It's basically the only
real Rock type in the game (lol Magcargo level 37 evolution and Tyranitar final Shadow Pokemon pre-credits). In a Doubles-centric game, Rock Slide sounds like a lot of fun. Too bad almost every boss after it uses Earthquake or Water moves.
Hitmontop: Intimidate in Doubles? Sounds cool. Needing to get the Brick Break TM from the level 50 Pyrite Colosseum to really do anything with it is not (lol Triple Kick).
A good chunk of the other mons are stuff that has gained evolutions since then (Misdreavus / Murkrow / Aipom / Piloswine / Yanma / Sneasel / Dunsparce) and / or have been benefited by the physical / special split and better moves - something a remake would naturally fix. You know what else a remake should fix? The absurdly garbage final boss fight with Evice.
Some mons in Colosseum are the solution to the next boss fight and then are underwhelming after, very bad in a game where you don't want to swap team members due to the high level curve. Noctowl helps for Miror B but then has little offensive presence afterward basically making it a purely Hypnosis / Reflect bot. Mantine is good for Dakim but falls off after that. Ledian is hilariously one of the better Venus counters thanks to Safeguard but then you drop it because it's Ledian LOL.
Pokemon XD: Gale of Darkness took a barely playable game in Pokemon Colosseum and simply made it utterly amazing. XD is a contender for my favorite Pokemon game period in spite of how battle heavy it is. That's what happens when the developers actually care about making a fun roster to use and making the difficulty more balanced (Pokemon Colosseum's idea of challenge is constant level spikes which just doesn't work in a linear game and essentially forces you to go grind by endgame). Outside the starters and some of the early Pyrite stuff, Colosseum's options are pretty dire. Pokemon Colosseum has great ideas, I just think it lacks the polish to be a truly fun game that I want to come back to consistently.