Bank shots and rebounds are a great way to get around the opposing teams blocking.
Pass ball amoung team members
Try to pass the ball among your team members often. The longer you have possession the more damage it can deal to your opponents, and it will also help to build up each characters' special meter.
Team captain
The team captain determines your team's passive ability at the start of a match. For example, Mordecai gives everyone a health boost while Muscle Man causes the Rage meter to build up faster.