To be blunt, Execution is fine the way it is and should not be changed. The problem for DA's before they changed execution was that there was a lack of bossing skill. Of course, you could combine Execution and Nethershield but it was not enough to match up to other classes. Now that they buffed execution at the cost of decreasing the enemies hit to 2 (3 for 5th job skill boost), it is better than ever and should not be changed back to a semi-mobbing skill. DA's do not need anymore mobbing skills as using Lunar Slash, Nethershield, Nether Slice, Thousand Swords, Demon Strike, Demonic Frenzy and the upcoming Blood Feast should be sufficient enough. Try to mix up your gameplay as oppose to relying only on one skill.
