Films:

MEH PLUS to GREAT:
Kahn, Undiscovered Country, Generations, First Contact, 2009, Into Darkness

(Kahn is great, UC/FC/2009 are good, Gen and ID are Meh Plus)

MEH
TMP, Search for Spock, Final Frontier (Final Frontier is almost Meh Plus but not quite, Spock is Meh, Meh was a word invented for TMP)

MEH MINUS TO SUCK
Voyage Home, Insurrection, Nemesis (Voyage Home is Meh Minus, I and N suck)

TV:

TOS
TNG
The rest (haven’t seen but a few episodes of any other series, none look very intersting).