Tactful ways to inform people that they're playing badly?

[SerLuke]

That's simple: people are doing their best and trying to using the kit offered by their class as their skill level allows it. It does not even have anything to do with how long a dungeon is going to take.

I don't mind have to wipe all the times a player needs to learn a boss as long the person communicate and ask for tips and/or is willing to listen to them. I also don't mind to do smaller pulls is the healer needs them because of any reasonable reason. However, I really mind when a DPS refuses to do AoE, in ShB there are zero reasons for not using it, or a healer spamming Cure/Physic on me when is not needed or standing there doing anything.

Same for tanks refusing to adapt to the needs of the party making the run take longer and/or bad usage of CDs. I think we can also add DPS doing really low damage, my own standard is low/mid-green.

Just out of respect for the other player in your party putting the bare minimum of effort should be the norm. Sadly, is usually not and the excuse is always a variant of "does not matter".

I was using completion time as diagnosis in my question if something is causing the dungeon run to go 30-45 minutes yes there is some sort of problem that needs to be addressed but like I said that’s been very, very rare in my experience, and not sure what low/mid green means.

[Driavna]

I was using completion time as diagnosis in my question if something is causing the dungeon run to go 30-45 minutes yes there is some sort of problem that needs to be addressed but like I said that’s been very, very rare in my experience, and not sure what low/mid green means.

FFLogs colour code for "ranks".