I've never played a Sentinel at all in any of the games proper, so I have very little experience with their basic playstyle. As most of my experience has been with Vanguards and Adepts, I'm having trouble trying to figure what the Sentinel's strengths are and how best to play to them. I'm playing the Turian Sentinel, as I don't have a Krogan one unlocked yet. The Krogan seems like it'd be more melee-oriented, which would suit my playstyle more I think, but is currently not an option.
So far, I've been playing mostly as a shield/armor remover, using Warp and Overload to burst through enemy defenses. However, Tech Armor seems like it'd be handy, but the 60% hit to my cooldown reduction when using it feels like it really hurts my ability to pump out the debuffs. I mostly only use it during the more static waves, like hacking or disabling indoctrination devices.
I'm unfortunately rather consistently coming in at or near the bottom of the scoreboard when playing with my Vanguard and Infiltrator friends (though having played one, I know Vanguards can be difficult to even come close to in score). I'm level 13 and just don't feel as effective as they are.
Do I need to focus on using my weapons more? I do have difficulty with this, as I barely used weapons at all on my Vanguard. Am I supposed to focus on tanking? What can I do to improve my Sentinel game? Advice for both bronze and silver/gold play is welcome.