I think the poster Natasha_Kerensky has the strategic and tactical analysis dead to rights, including the intelligent questions such as why the Vipers didn't leverage more against the Inner Sphere forces by moving along the edge of the Falcon LZ as opposed to continuously attacking Jade Falcon assets or sitting idle.
(they did a lot of both).
What is a bit disturbing, is how completely UNLIKE their writeup in "Invading Clans" was their overall behaviour. The turnaround from 'interesting possible faction' to two dimensional badguy was almost neck-breakingly fast. More importantly the degeneration from what promised to be a dangerous opponent into something infected by ineffectual crazy, and then to politically short-sighted suicidally stupid-crazy.
The Vipers weren't paired with an 'interior' clan-they could have cut their own route to Earth while sticking to the Truce line, establishing a supply line and nominally cooperating with the Falcons-but they didn't do that. They basically harassed the Jade Falcons until they got kicked out by the Jade Falcons.
which doesn't really make sense for a faction that initially rolled out with this 'secret extra knowledge' cult and collection of unique and weird societal ideas that kept them out of the spotlight for over a century.
The vipers showed up without a plan, which was very disappointing, and then, upon being kicked out, they suddenly had a plan but it mostly revolved around savaging the home neighborhood with political manipulation.
I'm not entirely sure, but I suspect the problem for the Vipers was that they really didn't have anything like a plan in those made up secret Kerensky Secrets they'd been using internally to justify waffling and ineffectualness, and after Tukayyid, they didn't have any core beliefs left.
Kinda makes me wonder what would've been different if they hadn't lost a Khan to Comstar.