Whether I daven with kavannah is a function of how well I concentrate on my davening, not how many people I have around me.
so one might think. certainly your kavannah is crucial, but not to the exclusion of the rest of the Minyan. the more one is attuned to his Neshama, the more one is connected to others that are attuned to their Neshama.
there becomes a unified communal Tefilah. (as well as the individual Tefillas also)