RetroAlien said:

Doesn't make sense that Storm Troopers are clones of a bad-ass bounty hunter but are all killed easily in episode IV.

That's a bit of a non sequitur. There's no reason to believe clones of a bad-ass bounty hunter would be good soldiers, or even good bounty hunters. There are a lot of genetic components that contribute to military fitness (above average endurance, strength, stress response, intelligence), but they are not sufficient for being a good soldier. Boba Fett, while crafty, does not seem to have been an especially good close-quarters fighter.

And I don't think they are easily killed in Episode IV. I think we see three die boarding the Tantive IV, and another was shot by a concealed Princess while they were searching the ship for droids. Two were killed on the Millennium Falcon after it had already been declared safe by an officer. After that, the stormtroopers are under orders to permit the safe passage of the Rebels back to the Falcon, so we don't see their combat effectiveness. In the SE, we even see that most of the stormtroopers have been ordered to wait in a TIE hangar, so they don't interfere with the Rebels' daring escape. So there are perhaps three killed in direct combat, three killed in special circumstances, and a number sacrificed for the glory of the Empire. Not enough to draw a conclusion as to the effectiveness of a force that must number in the millions or billions, but the ones we did see were pretty competent and not easy to kill.