QUOTE (masterminicon)
But, like all bad guys who gain a huge upper hand over the good guys (even to the extent of other bad guys), the opposition come through stronger and more determined than ever, and he eventually was defeated.
Umm... not really. Starscream killed Afterburner, Air Raid, Astrotrain, Blitzwing, Blot, Bluestreak, Brawn, Buzzsaw, Chase, Cutthroat, Fireflight, Freeway, Gears, Goldbug, Grimlock, Hoist, Hound, Hun-Gurrr, Jazz, Jetfire, Laserbeak, Lightspeed, Mirage, Nautilator, Nosecone, Octane, Omega Supreme, Overbite, Rippersnapper, Rollbar, Scattershot, Searchlight, Seawing, Silverbolt, Sinnertwin, Skalor, Skydive, Skywarp, Slag, Slingshot, Sludge, Snaptrap, Snarl, Soundwave, Strafe, Swoop, Tentakil, Thundercracker and Wide Load - and none of them barely even scratched Starscream!
And none of his enemies were able to defeat him.
QUOTE (masterminicon)
But most of the time, the moment the tide turned, even before whoever was commanding the Decepticons at the time (I forget who commanded besides Megatron and Shockwave)
Ratbat (who'd assumed command after Shockwave's demise) and Scorponok were Decepticon commanders at the time of the Underbase Saga
QUOTE (masterminicon)
saw it, and turned tail and ran. He turned tail and ran after every failed attempt at taking the command post of the Decepticons. Not so with Animated Screamer. He may have not succeeded, but he just didn't give up, and is still trying.
Yeah but that's only because he's undead.

He knows that he can keep dying and coming back. This wasn't the case for G1 Starscream, who - believing that he was mortal - had to be more conniving. And he was, such as when he sowed seeds of dissent amongst Scorponok's ranks, then allying with Shockwave's separatist faction and declaring civil war against the Earth-based Decepticons.