I feel like the tier system here is too vague to realistically be applied to a lot of characters, though that's probably most indicative of my background in combat-based roleplay rather than the general case.

The system that I (and others who originate from where I do) use categorises characters by the scope of their power more specifically than the existing tier system posted above does. Part of me feels that the bands between tiers aren't concrete enough or small enough to realistically differentiate between characters that broadly fit into a given tier at opposite ends of the spectrum - but upon closer scrutiny of the system I'm used to using, the problem still exists even if it is lessened in comparison to the system used here.

Following this, it may be worth having the most experienced members of the combat section come together to decide upon and create a new tier system (assuming that such has not already been done)?