Don't fret too much about it Smed. You did fine, and honestly, that fight is rough, and a lot of classes do feel "alone" during the battle. Magmadar is one of the first boss fights that people experience where you cannot just stand still. You have to be moving almost the entire fight to survive, and to be effective. It's sort of similer to the Earwig boss in AQ 20. The entire party has to stay mobile the entire time. Makes it hell for Shaman's totems, but what do you do?
Thankfully the 5 piece EF set bonus adds 10 yards to our friendly totem radius, so that helps for mobility sake, but it doesn't make it much easier.
That said, the first few times I encountered Mags I spent most of the fight face down too.