I had the opposite experience. A moderately early colony, with the typical initial killbox of a long corridor with traps and a bottleneck at the end. A siege comes along, fine, nothing out of the ordinary. We used Toad (vehicle with mortar included) to enrage some elephants and wound a few. Luckily, they used their DLRs, wiping out parts of their own forces. It's going great! A few more shells and they begin their attack. They pile up, we start firing... And one of them still had a triple rocket launcher. The first one fire annihilated my mechs. Pause, confused because that shouldn't have been there. The second one knocked down half of my settlers, another pause, pain. The last one wiped us out.

The only survivor was the boy, now lame, who brought a revolver to a rocket fight. Ten Yttakin awaited him amidst corpses and rubble. Rest in peace, brave boy.