Firstly, I want to clarify that this is just a suggestion, NOT an offense.
I found that that Spiral Knights has some flaw in managing and displaying health bars, like:
1) The health bars of monsters. We should at least see how much remaining life the enemy has after it gets hit. This can greatly help the knights to plan attacks on monsters and not guessing how much blows to be delivered before knocking down the monsters (especially in the arena)