An OK little game to remember the original game from the nineties with some flaws that cannot be overlooked.
Clearly designed originally as a free-to-play (an insame amount of challenges, in-game achievements requiring 50+ hours of gameplay and more than a thousand matches to win, different sort of currencies, XP, slot machine, etc...), these mechanisms only strenghten the impression of a lack of content.
Which is sad, because the grinding slowly kills a game that had good efforts put into it (there's decent writing, overall good controls, balanced AI). This should be a lesson to game designers: forcing the player to put more hours than he normally would have only makes him/her notice the little things that are wrong (repetitive sound design, aberrant mallet behaviour on some occasions, too many menus...).
If you are bent on 100%ing games, just don't buy this one, the time you will have to spend is not worth it. For the others who might enjoy a few arcade air hockey matches, you can spend a few bucks when the game is on sale.