Online poker sites that are legitimate and have passed through third-party scrutiny are NOT rigged. But some players won't believe this, and feel they are being cheated over issues such as: Too many bad beats. More pots being won by depositing players (to encourage new players)
If you were only wondering if online poker is rigged, the firm and final answer is no, the game is not rigged, and countless pieces of evidence support that claim. However, this does not mean you are perfectly safe when you play online poker, as there are other things you need to be careful of.