The problem is describing the gameplay to someone not familar with DOTA. At a glance it can be confusing and not overly intuitive to work out how it works - ie utilising your own creeps vs theirs etc.
if you just take your time to play a game or two and you still dont understand how the game works then you are fail.
Your comment reminds me of those "I'm rubber, you're glue" playground insults.
The game may be obvious to you, as well as many other people who have played DoTA. However, for those that don't, there's a lot of things in this genre that aren't immediately apparent.
From a high level point of view, noobs have no chance of knowing the following:
-tradeoff between increasing damage/attack speed, versus health/armor
-how to flag lock
-importance of citadel upgrades
-the massive penalty of dying
-I can go on and list more, but you probably get teh point by now.
I've met so many people online on both my team and the enemy team who had no concept of these things. Needless to say, the game was basically ruined so they played worse than AI.
At the very least, a tutorial would help bring the skill level floor up a bit. It would help make noobs not so nooby.