The idea of a faction is always a hit or miss. Typically, a solid faction should have an incredible level of synergy and must function as a well-oiled machine.
In the 1980s, the Four Horsemen set the standard of what a good faction looks like. As far as the original Horsemen, and a couple of incarnations following, each member knew and understood their particular role in the group to make the group function properly.
These days, factions just aren't the same. The closest stable we've seen compared to the days of old was Evolution. Every member had a designated role and executed that role perfectly, and each spawned off to have a very successful singles career (Ric Flair and Triple H were already established main eventers).
The WWE is trying to revive the faction concept by forming groups such as the Nexus, 3MB and the newly assembled Shield.
Unfortunately, the WWE has seen a cluster of not-so-good factions throughout its illustrious history that are worth mentioning, especially since it's important to learn from what worked and what didn't.
Yeah, you may be thinking DOA and the New Nexus top the list. However, there are some worse than that. Here they come...