I agree, it's not fair to put the 2.0l Vectra against the D'tec.
Over here, VX (GM) do a GTE version that has a V6 2.5l, 195bhp and over 200lbs torque, this is against the Mondeo ST200 and does give it a good race to about 120, then the ST leaves it (believe me

)
VX also did a limited number of ST vectra's, these were 3.0l and about 230bhp, very scarce and I've never raced one.
There's now a 3.0l GTE version which competes with the new Mondeo ST220, I think it has about 230bhp and bags more torque.
Gary