MrPink said:
If you want to play a "world eater army", you're playing a themed army anyway meaning you should play it fluffy.
I don't see the point in playing a themed army, then moaning about limitations. If you want to play world eaters, you know what you're getting and you know what's going to happen to you (you either charge forward and kill everyone and get shot to pieces, or just get shot to pieces).
That's some solid advice, really. The Cult Armies have limitations for a reason. They're meant to be fluffy and give something out of the ordinary, not necessarily be as competitive as a pure Black Legion force.
As World Eaters, you have six real choices -
1) Arm all champions with a Powerfist and possibly Daemonic Strength. You should be doing this anyways, but it's good to reiterate things sometimes. Suffers against Skimmers and Fast Vehicles.
2) Daemon Prince/Greater Daemon. Pretty good, though getting strength high enough to be consistent can be a pain. As with option #1, Skimmers will hurt you. Fast vehicles are still a pain, but can sometimes be negated by Daemonic Flight/Speed.
3) Dreads. Weak armour and expensive weaponry. Best thing is that they're not useless if the enemy doesn't field tanks, as they can participate in Close Combat.
4) Predators. Strongest option. Can make a very strong anti-tank vehicle for little investment, and can be hard to remove. Downside is that they tend to not be very mobile, and if the enemy doesn't field tanks they're often wasted points.
5) Defilers. Only strength eight, but can make up for that with Ordnance Penetrating hits and Indirect Fire. Bad side is their shots can scatter and that they're quite expensive.
6) Don't play World Eaters. This is a serious suggestion - instead, play a heavily Khorne themed Black Legion list. You lose the benefit of free Champions and bonus summoning rolls, but gain the ability to use Obliterators, Raptors, and Havocs. Obliterators alone make this option worth considering, as they are the most versatile unit in the Chaos Codex.