Id say every game needs a noob friendly character and kratos just does the job
The purpose of noob-friendly characters is to give new players a fairly easy means to get accustomed to the game. Once they play more, however, they will find out that the character isn't actually that great, and they notice that the easy tactics they were once presented with are now not as useful, so they would then use the basic knowledge they've gathered from the noob-friendly character, and move on to more advances tactics. While it is granted that after the game has been out for a while, every player will learn how to deal with the noob-friendly characters, it is still good that it will lead online to have a setting of "Get better, or go home and cry about it".
Kratos, for example, is always useful. He's noob-friendly as **bleep**, and can't really go stale with his simple tactics, because they WILL ALWAYS WORK. That's the problem with him, he's an entry-level character that is also one of the strongest.
The problem is is that these characters should be easily playable, yet not be too powerful (as in, there are much better options).
However, Kratos is easily playable AND top tier.