yitayningwut- That may apply to to eating, but not necessarily to other mitzvos. The Chofetz Chaim says that we pasken that by Mitzvos D’Oraissa Mitzvos Tzrichas Kavana. Without Kavana you may not be yotzie at all.
In regards to Hilchos Sukka, for example, if you dont have the kavana of ?? ?????? ?????? ?? ??? ????? you are not yotzei (and its as if you are not sitting in a sukkah at all!)