The Kai Allard-Liao Trilogy:
MechWarrior 1: Kai Allard-Liao
MechWarrior 2: The Duel at Solaris 7
MechWarrior 3: The Duel at Strana Mechty
Red Dawn (featuring a DCMS invasion of Tharkad).
Seven Mercenaries (featuring seven down-on-their-luck mercenaries protecting a generic planet on the edge of the Periphery from bandits).
Seven Warriors (the Clan remake of the same film from the Clans' Golden Age - featuring seven generic Clan warriors, except for Kambei Kerensky who is probably from Clan Wolf (but it is never specified), Kikuchiyo is a Freeborn MechWarrior, Kyuzo is a talented Ristar who initially scoffs at the idea of fighting alongside Freeborns and Solahma - widely regarded as a horrible example of Clan jingoism, it nevertheless remains a cult classic in the Inner Sphere, even into the 3140s)
The Magnificent Seven (a post Jihad remake, featuring a group comprised of expats from across the Inner Sphere, including an idealistic Republican and a former Smoke Jaguar, widely regarded as inferior to both its predecessors)
Ronin (about a group of former spies from all the Great Houses attempting to retrieve a briefcase from a mysterious benefactor - which turns out to be a Word of Blake cell and one of the former spies is not so much a former spy).
Solaris Vice (about a pair of undercover cops - one from the Draconis Combine - busting narcotics smugglers)
We Were MechWarriors Once… and Young (about a group of MechWarriors assigned to an SLDF CAAN Regiment during the Amaris Civil War).
Sands of Twycross (a joint Clan Jade Falcon/Lyran Commonwealth/Clan Diamond Shark production made in the immediate aftermath of the Wars of Reaving, about the Second Battle of Twycross during the Clan Invasion. Filmed on location and unusual in that one of the film's military and technical advisors was a Clan veteran of the battle - Clan Jade Falcon's Star Captain Joanna. Hailed as the best film ever made about the Clan Invasion, some have suggested that the film painted too generous a portrait of the Falcon Guard.)
The Last of the Nova Cats
Blood Germanium
3:10 to Fronc