Wog doesn't resemble the original heroes, and neither does the fifth installment. The world was completely changed, and everything was started from scratch. And how it is – I personally didn't understand. The sixth one is just… no comment, as they say.
1, 2, and 3 were an evolution. With the fourth part, global changes began.
And the fifth one, it's less similar to the third and second than the fourth.
I repeat, if you mix the third with the fourth, you'll get the best game. Not with any other, but specifically with the fourth.
Offtopic: Is it possible to increase combat morale?