Pro Helps new players
While this makes it a worse competitive game, it makes it more accessible in the office for everyone to be able to play. A game where a few players can just dominate everyone else won't be fun for everyone, and will discourage people from playing in the first place.
Pro Multiple game modes
There are 4 game modes in Mario Kart 8. There's Grand Prix, the main game mode where you compete in 12-player races using various items found in the level, Time Trial, where you fight against the clock, VS Race, where you can set up your own rules, and Battle, a variant on a typical race with 3 balloons added to each player, allowing you to pop your opponents balloons for points.