I've done Gold with her a few times solo. You better have a damn Geth Scanner or you'll get your ass handed to you. You have to cloak in cover then SS. If you cloak in LOS then try to SS, it might end with you with a shield or sword shoved up your ass when all aggro is focused on you.
Well, why would you use that kit for solo? Or play solo in a MP game anyway? 
During solo play I usually stagger or stun my target first so it can not attack when I use SS... much safer that way. Ideally you attack from out of LoS, but that's difficult to do when everything on the map comes walking towards you.
Time to cloak and Teleport for that initial SS is longer than nade spam then you have a little longer transit to the next spawn because you are teleporting farther away from the next likely spawn. A drell adept in example is reave, throw cluster or two then on to the next spawn in less than the time it takes the shadow to teleport. QMI and other high damage nade spammers are the same way.
Well, it is longer than nade spam, true. You need ~2sec for the cloaked SS (not that cloak takes any time at all) and one sec for nade spam.
I'm pretty sure I already mentioned that in a post above... Shadow has a high TTK but not on Talon GI or nade spam level.
Teleporting into a spawn is suicide, you can't take on more than 3 enemies at once and even that requires optimal circumstances. Shadow is an assassin, not a frontline warrior.