Having disables, and escaping and chasing abilities, are part of being a "good" champion. If a ranged character deals high magical damage, and can stun in an AoE, then it's a top tier Magical DPS champion (Annie). If it deals high magical damage, and can't stun in an AoE, then it's probably a tier 2 Magical DPS champion (Kassadin). If its enormous AoE damage outweighs the fact that it has no disables, it can still be tier 1 (Twitch vs. Ashe). Part of composing the actual team is picking a balance of power heroes, and heroes with disables, and getting a nice mix of roles (physical damage, magical damage, tank).
So, for example, using this tier listing:
Good Team: Annie, Twitch, Sivir, Alistar, Twisted Fate
Bad Team: Fiddlesticks, Nunu, Tristana, Sivir, Kayle
Bad Team: Ashe, Jax, Evelynn, Amumu, Warwick
The composition is up to you, but the tiers help you decide what to put in each role.
I've changed the last category to Hybrid so you understand my meaning better. Those champions can feasibly be built in more than one way.