I've only had the game a few days but this is what I've learned:
Play to your titan's strengths. The titan I've mainly been using has been scorch. Since scorch has a massive instantaneous damage, with the primary shot, the gas can, and the firewall. Also, stick close to cover so you can pop in and out with your reloads. I found that it worked best staying behind the more aggressive titans like ronins and legions, while firing your thermite over their heads.
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Yup. And use your traps effectively. Try firing one behind your enemy and waiting to ignite it until they get distracted.