There is not a single quantifiable "dota" skill, there is several dozen small skills, of which people are better or worse. Some players are very well rounded, while other can be very good in a few skills and utterly fall flat at a wide range of skills. MMR is a reflection of this average.
Pay attention of what your team mates seem to be good and bad at. Normally, its actually really easy to pick up on defincenses, and from this you can actually guess at what they are good at and try to play into that.
Pay attention of what your team mates seem to be good and bad at. Normally, its actually really easy to pick up on defincenses, and from this you can actually guess at what they are good at and try to play into that.