Well BioWare committed the Cardinal Sin of gaming, they allowed multi to take away from single-player. There should have been a SP mission to increase fleet effectiveness, or Shepard do something that causes Admiral Hackett to train all of those ships Shepard sends him. Right now multi is pushed into your face to get fleet effectiveness.
I'll amend my answer, there is one DLC I would buy, if it was a mission to increase fleet effectiveness in SP to 75%. I still think they took it out from planet Aequitas.
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