Okay this ain't even a review, just gonna vent.
Rayman for PS1, let's go.

So for a 1995 platformer this all looks pretty great right? Colourful, the animation is supersmooth mostly too. Soundtrack is decent, sound effects less so. However presentation only gets you so far. See all those spikes? That's Rayman for ya.
So this game definitely credits several people as "tests" (?) in the end-credits. Not sure what they tested but it sure wasn't playability. It controls alright~ish, if a bit finnicky and sluggish which would be alright, were it not for the absolutely satanic level design.
This game does absolutely everything it can to willingly screw you over! Spike traps, off-screen death drops, enemies spawning behind you, invisible spikes, spikes with a longer hitbox than their sprite makes it seem. Some vital parts of the level can only be triggered by standing on specific spots (unmarked of course).
There's regular enemies who take 3+ hits, constantly duck under your punches, there's enemies too small to even hit at all, they all respawn constantly anyway. If they hit you, get out asap cos your invincibility frames are very short - there's one beetle in particular who can go straight to hell. He'll regularly drain your three-block healthbar. And then you can start a level all over, or maybe only halfway back if there's a checkpoint (way too few of them).
But why even have a healthbar if you're just gonna make almost everything a 1-hit kill? And of course your lum count resets everytime so good luck farming 100 of them for one measly extra life. Now, maybe I just suuuuuck hard at platformers, but I just cheesed the whole game with the 99-lives code which I used FOUR TIMES.
That's 396 lives, almost all of which I lost!! Oh and of course it ends on a dissapointing bossfight where you
don't even fight the actual bad guy, who's already barely characterised. Oh and just to put a cherry on top of it, you can't even get to the bossfight without 100%-ing all the levels! I was at like 40% max, so yelled a big loud swear at the TV and used another cheatcode to get there.
Rayman absolutely astounds me, because it became a big franchise right? For part two they literally built two full games (Tonic Trouble as a test and then Rayman 2). That's cool and all but who in their right mind played this and thought "yeah this needs a big-budget full 3D sequel! It'll be our new mascot!"
Sure Rayman 1 is gorgeous, but that's literally it's only selling-point. Maybe it just sold stupidly well or something? Look, I like Michel Ancel's work a lot and future Rayman games were much better, but this game was absolutely
screaming for an Easy Mode or something.
Rating: Rayman is the biggest proof I've ever seen how 1 aspect (difficulty) can utterly destroy almost any merit an otherwise fine~ish game has. Recommended to absolutely nobody, watch it on YouTube if you must.
2.5/10 solely for the visuals.