It's not that it's bugged or anything, but rather is so damn hard! As soon as i enter the star the daedra there fireball my ass to Sovngarde faster than a Skeever on Skooma. HOW DO I DO IT?

You don't need to kill the Daedra, just the main guy you spoke to when you entered. As soon as he's dead you get pulled back out. It helps if you have plenty of health potions to keep you alive long enough though. If you are a mage summoning a Fire Atronach will help to deal with the Daedra as they have resistance to fire. If you are a warrior you need to run passed them to get to the main target.

I'll try but damn, they are some tough Daedra.

I had to resort to repeatedly conjuring Dremora Markynaz with the Sanguine Rose. Backed him up with fireballs from afar and took out the baddies one by one. I tried several times to do it more traditionally for a warrior (level 35ish) and got my [censored] handed to me.

Bizarro Todd run past fire shooting creatures gulp health drink and whack man with sword. He fall over. Bizarro Todd win again. After losing several times.

I just sprinted past them and went after Malyn, or whatever his name is. I'm Dunmer and had Boots of Waning Fire, so their fire spells didnt do much damage to me.

I summoned fire atronach to ... take the heat off me ... for a few seconds and channelled a Blizzard from a scroll. That killed the group in 5 seconds (blizzard follows you as the centre) and was done on master difficulty at level 1.

Since you don't have to care about the dremora the easiest way to get past them is to become etherial. Simply run past (through) them and kill the main guy. Though I'm guessing you have already dealt with the situation by now and don't require any hints at this point.

I used invisibility potions to get close to the guy

I had one point in the alteration perk that gives magic resistance, so it wasn't that hard for mine unholy paladin (lol wut).

Try to chug some potions that give resistance to magic and fire (and maybe frost, can't remember if they use that too)

This one took me several tries. Here's what I ended up doing:

As soon as the dude quits yapping, I shouted at him with fu ro dah (the one that knocks em down) then I sprinted to him and began wailing on him. He got back up and I kept hitting him until he died.

Then I sprinted back to the front as I faded out.

I didn't use a single potion.