Yes I agree and you can spot these players as you will see the occasional song going up or cleric popped on and quickly took off as they realised it was the wrong time. Everyone should strive to use every useful ability they have available to them.If a player is trying their best, but are using imperfect rotations/forgetting to use certain cooldowns or optimizing their downtime as a healer by throwing in DPS when they're safely able to do so, I feel like you could call them a 'good player' in terms of the fact that they're trying, but perhaps they're lacking in the skill department (I refer to skill as in skill you can improve through practice, not innate skill where they're simply "dumb") and just need more practice or some advice. Unskilled, sure, but they're trying.
Also while discussing clerics etc. How many healers here have clerics as their first cross class instead of protect?