TZ is the greatest pinball machine ever made, and it has a very deep and complex rule set. Until you understand all of the rules, you will not fully appreciate it.
It may take you many games to learn the rules, but once you learn the rules and have a decent game, you will say okay I get it now.
TZ is a players game, and you may never get it if your skills are lacking. TZ is one of those games that can kick a decent player's ass 4 out of 5 games, but that one game is so awesome that it keeps you coming back for more.