Joey is your man, there. I believe they have good access to camo, so they can do a sneaky force, they also have good bs and wp and one of the coolest guns in the game - the plasma rifle! Nearly all armies can do everything, just some factions are better at it than others.
Some of the unique things they have going for them are:
-Impersonation (only they & haqq have this)
-Plasma rifles
-Sepsitor (A WP attack that can possess enemy troops and make them yours!)
-Seed soldiers (troops that deploy as markers, and then can be 'birthed' with an order or automatically grow on the 2nd turn
If you haven't already, check out the official Infinity the game forums. It has problems handling traffic right now, but it has really good faction-specific guides.
http://infinitythegame.com/forum/index.php?/topic/19322-a-combined-combined-army-guide/
N