None of them are going to be perfect.
The thing I like about iFlicks is the ability to set up rules when tagging. I use it to regularly tag TV shows I record with EyeTV - having rules set up to tag based on TV Show name with the AppleTv appropriate square album art that I find and store locally for the few series I record is invaluable.
Everything looks great, is tagged correctly and the art is in the proper format.