The nice thing about the SCAR is that the reload is really quick, so its great for peaking. I would imagine you would need to adjust your play style if your constantly trying to take down 3 people with a single clip.
Yup it's a bad habit picked up from using LMGs, however you can get a triple with the SCAR if you HS (and have the extra round chambered).
The fast reload is quick though, you can duck and reload fast before someone flanks around your cover normally.