Shoulder charge and focus on upping your armour and agility stats. forget recovery. I use dead orbit armours to max out strength and discipline. The super just comes with kills and orbs. Use your agility to move as fast as you can and shoulder folks if you know they're alone. Be smart about it though. You can't just run into a group and hope to do well. Shotguns and Heavy weapons are the way forwards. Particularly the Zombie Apocalypse or Super Good Advice machine guns. Titan is probably the toughest class to be consistently good with imo (I'm sure others would disagree).