On the other hand, Transformers have had eons of war to test their weapons with, and have more horrific forms of firepower (ever heard of Gideon's Glue?)
http://tfwiki.net/wiki/Gideon's_Glue
Transformers are made of exotic metals, with strange properties. In some cases, they have self-repairing armor, or attachments that act as an extra layer of security (Optimus Prime's mysterious, disappearing trailer and roller). If all else fails, there are always oddities, like Megatron getting his hands on the Heart of Cybertron, electrum, EMPs, fusion cannons
http://www.oocities.org/sslui_marauder/fusncann.html
and other things I'd rather omit.
AND as for SunStorm...
"Shockwave's experiments to fit a solar-powered fusion reactor into cloned Decepticon warriors reached their fruition in Sunstorm... Sunstorm's structure has been augmented to endure the enormous stresses involved. He was the perfect soldier; he possessed the ability to manipulate electromagnetic energy, enhanced regenerative capabilities, and a blank slate of a mind waiting to be written according to Shockwave's design."
When all else fails, look to the impossible...
http://www.screwattack.com/news/death-analysis-g1-optimus-prime-0
Any questions?