For low level players, maybe. High level dota includes both strategical and tactical nuances that are not trivial. Map movement, ward placing, map control, when to push, when not to push, team composition, picking and counterpicking, laning, rune control, seeing when it's profitable to attack and when it's costly, positioning in team battles (!).

Besides, there is a great portion of skill in laning. You can watch best players like dendi winning 9 times of 10 on the middle lane against other top players. It's a spectacular feat.