I'm playing SMN and I just came from an AK run where our SCH healer was ragging on me, right from the very first pull, about how bad of a player I am because I wasn't using a DPS rotation she thought was better.

I was using Ruin II + Energy Drain, and he thought I should be using Ruin I + Fester because he thought it did more damage.

Ruin I (2.45 cast time + 2.45 recast, 80 potency) + Fester (300 max potency)
You can cast 9 Ruins and 3 Festers every 60 seconds: (9 * 80) + (3 * 300) = 1620 total potency damage per 60 seconds.

Ruin II (instant + 2.45 recast, 80 potency) + Energy Drain (150 potency)
You can cast 21 Ruin IIs and 3 Energy Drains every 60 seconds: (21 * 80) + (3 * 150) = 2130 total potency damage per 60 seconds.

A difference of 510 potency, or 32% more damage. This is not an insignificant amount.

So please, just let players play how they want. Just because they're not following the norm, doesn't mean they're bad players.