LOL I can! Couldn't stop dying on Silver with lvl 18 Turian Soldier. Switched to Human female soldier and started dominating the scoreboard. It's probably the lack of dodge maneuver that screws me up.
Quarian Male Engineer feels comfortable, I might try him. When I played him it didn't feel like I was doing a whole lot, but was consistently scoring 2nd. He doesn't have escape ability, though.
Yeah, the Turian Soldier is surprisingly squishy on Gold. He does have higher than average shields, but his poor mobility easily negates that. Plus, he's a class that relies on weapons, and if you're a Silver player, you probably aren't quite that good with weapons yet (and probably don't have the best weapons to use either).
I always say that when you're moving up a level, you should use classes with better survivability. Killing scales pretty well from one level to the next, but when you're first moving to Gold from Silver, you don't really have a sense of what kind of damage you can take before you go down. This means that you die a lot, and all the killing power in the world doesn't help in spectator mode.
TGI and AIU are good choices, as mentioned already. Try characters with damage reduction powers and play them as you would play in Silver without damage reduction. Any Krogan gives you good survivability, you just need to really watch out for Banshees. I actually prefer my Krogan with an Adrenaline Mod for Gold. The Pull/Reave Justicar with the Acolyte and Hurricane is also an excellent class for moving up a level. And the best may actually be the Batarian Soldier. He is very survivable because he moves pretty well (especially with Adrenaline), he has high shields and damage reduction, and he has one of the best staggering powers - if you're in a jam, just fire Ballistic Blades and GTFO while the enemies are staggered. Plus, Inferno Grenades make boss enemies easy. Just get them down to their armor, toss a grenade or two, and sit back and laugh while they burn.