Yeah, a lot of people kicked the bucket in the last few episodes.$
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The dead list:
Tarantulus: Killed in "Other Victories." Possessed by aliens, then blown up by his own device.
Depth Charge & Rampage: Both killed in "Nemesis, Part One." Depth Charge killed Rampage by driving an energon shard right through his spark. The resulting explosion also killed Depth Charge.
Tigerhawk: Killed in "Nemesis, Part Two." Got blown to bits by the Nemesis. He put up a good fight, though.
Inferno & Quickstrike: Killed in "Nemesis, Part Two." The pair, attempting to find a new base for the Predacons, got blown up by the Nemesis as well.
Dinobot II: Killed in "Nemesis, Part Two." Following Rampage's destruction, he became good and helped fight Megatron, but went down with the ship.
Three characters survived Beast Wars, but didn't get to Beast Machines:
Rhinox & Silverbolt: Their fate is unknown. They got off Earth along with the rest of the Maximals, but don't show up in Beast Machines...
Waspinator: Waspinator has a happy ending at last. Tired of getting blown up all the time, he leaves the Predacons. We last see him as ruler of the early humans, left behind on Earth.
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"Alright... Who wrote 'Beavis and Butthead rule' on the back of my skull?"
- Captain Jean-Luc Picard, Star Trek Parody, The Critic