I find IMDb to give a user's (1? to 10 in .1 steps) rating vs. the Tribune's critic's (.5 to 4 in .5 steps) rating. IMDb will generally have ratings before Tribune and over a wider set of films. A rough rule is that IMDb is numerically 4 higher than Tribune. They can differ by up to 2 stars, which may reflect the difference of critics and the rest of us. I wish Sundance and the old IFC were in HD and I still have some Vooms.
I search the Dish guide channels 388 down to 300, mostly HD only, for 3 to 4 stars (occasionally 2.5) and then look at IMDb for those above my storage threshold, currently 7.3 or so. I now have 1120 HD, 570 TCM almost-good-enough up-converts, and 260 SD plus many well-rated series. I need to re-record a lot of older MPEG-2 HD to save space. The 2 TB of PBS OTA recordings, not in above, sure could use MPEG-4 re-recording but will they be repeated? I try for under 2300 MB/hr with 6300 MB/hr for OTA.
It may help to read Maltin or Ebert to decide if you want to see the movie. You can get Ebert delivered by calibre for your e-reader--free.
-Ken