2.4 patch was awesome for balance changes, even still necro suffers in some aspects, i would suggest 2.5 patch to:
Buff a little fire golen life and defense, he is dying a lot.
Fix Iron golen to stay alive after create a new game, this would help a lot and we could play with runeword iron golens.
Buff skeleton mage damage because they are very weak and skeleton warriors are very better, with mages buffed damage we could have a summon mage build.
Buff decrepify in some way to be more competitive against amplify damage and lower resist or maybe create some sinergy.
Thats my ideas for a better necro.