bwtf.com has a lot of Beast Machines reviews.
Despite its problems, I actually like the Beast Machines line a lot.
Recommended:(not comprehensive)
Night Viper is my absolute favorite--the second original snake mold after Corhada
Skydive--interesting aesthetic; amazing poseability.
Night-Slash Cheetor--anime accurate sculpt, though not colors
Jetstorm--Overcracker covered him already.
Dinobots--these are all repaints of BW Neo molds(and BW Ultra Megatron), if missed them then and in Universe, these are grand replacements.
Magmatron--direct rerelease of the BWNeo version. Target exclusive; probably easier to find original.
Mirage--small, yet soild
Beast Changer(Savage/Noble)--awesome idea, interesting execution
Megabolt Megatron--turns into a giant head. 'Nuff said.
Decent:(not comprehensive)
Tankor--a little loose in the joints, but otherwise pretty solid; not at all anime accurate however
Thrust--same as Tankor. Looks best in Unicycle mode, but can't stand. Robot legs look stupid
Blastcharge--good alt mode, good robot mode. Low poseability and looks stupid with missiles in launcher(robot mode)
Battle Unicorn--Yes, a UNICORN. Interesing alt mode, clever transformation, awesome robot mode, and amusing bio. His body has difficulty staying together in robot mode(only if you articulate him in a certain way)
Blast Punch Optimus Primal--looks good in both modes; limited elbow articulation
Not Recommended:(not comprehensive)
Quickstrike--ugly alt mode, stupid transformation
Buzzsaw--awesome figure....bad plastic(i.e. VERY soft
Rattrap--so out of scale its not even funny
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My favorite BW basic who did not appear on the show?
Razorclaw, hands down.