You don't need to grade your footage, but I think any DSLR footage needs a little working on, before and after.
In camera keep the sharpness at 0, if you aren't going to go through colour or davinci then keep it fairly neutral accross the board, keep the iso as low as you can, and consistent accross shots in a sequence.
General rule: you can recover underexposure, difficult to recover lost detail in over exosed shots.
In your NLE add .5 pixel gaussian blur over all footage (on that track, not on astons etc) magic bullet do modestly priced versions of it's quick grades like looks or mojo, and any decent NLE will let you add vignettes, corner blur, saturation etc.
Keep it simPle in camera, keep it neutral in camera. Try and get your white balance right manually, or shoot a close preset, use some kind of greyscale referrnce to help shot matching in post.
Dslr footage needs post, you needn't get into flat shooting, luts or high end grading, but in my experience you'll rarely be able to use footage straight out the cam.