The original TOS effects aren't rubbish. They're charming and add loads to the atmosphere of watching a late 1960's sci-fi TV show. Seeing the show cut to a cartoony, swooshy CG just seems wrong to me. Like watching half a show.
I think if they'd gone ape shit with the CG and made pointless changes everywhere (why not add CG aliens wandering about in the background of every scene? Arex! M'Ress! Naraht the Horta from the novels! Redesign the Enterprise! Redesign the D-7 cruiser! CG bumpy heads on the Klingons! Insane modern-style space battles!) it would have been interesting, and worthy of the amount of angst it's caused online.
I think if they'd gone ape shit with the CG and made pointless changes everywhere (why not add CG aliens wandering about in the background of every scene? Arex! M'Ress! Naraht the Horta from the novels! Redesign the Enterprise! Redesign the D-7 cruiser! CG bumpy heads on the Klingons! Insane modern-style space battles!) it would have been interesting, and worthy of the amount of angst it's caused online.