The whole idea behind casual games is that they're easy to digest, There are no difficulties in learning how to play them or time being wasted reading about special moves or hidden features before the game takes off. Such games work well on computers where you spend a few minutes before moving on to something else, but they haven't worked so well on video game consoles when you're putting in a disc.
That's not to say casual games downloaded or played through the Internet on a game console aren't fun and workable, but there needs to be some special "hook" if it's a game disc trying to do this.
101-in-1 Party Megamix has no problem meeting its obligations to casual play. The title says it all - there's 101 games to choose from. Each can be quickly understood and played. Each provides fun for a few minutes or more. Each will have its supoorters and detractors.
There are many games with big graphics that scream out at you. You'll find these in the action games. There are also games where the graphics are smaller and more sedate - such as solving puzzles. The Nintendo Wii can provide a reasonable color palette so there's no problem in having lots of animated characters on the screen that don't blend into one another.
This isn't to say that the Wii doesn't have the hardware smarts to build a quality graphic image on the screen, just that it doesn't have to work so hard when it's a casual game being played. Then the issue becomes whether the game designers have become lazy or not. Obviously they're full of caffeine because little touches needed to pump up a game beyond just a simple background/foreground with animation has been done here. Check out the damage the Biplane takes in its game to see what I mean.
Audio needs to do more than just provide pretty music in the background when playing a casual game. There needs to be the kind of sound effects and ambience that lets the player suspend his/her belief and get into the game. This is just as important in a casual game as any. There's so many games that the Wii gets quite an audio workout. Sure there are the usual explosions and BAM sounds, but there's also more delicate audio when the game demands it. The differences in the sounds between games is another way to keep the games from starting to "merge" into an amorphous blob of boredom. 101 does this well. You won't get a headache from the sounds, but by the same token you won't be ignoring them either.