These fights arent that hard, The issue lies with the ease of grouping.

Being able to click a checkbox and get a group of people you will never see again has detrimental effects.
Especially with a lot of the community not having an MMO background.

These are fights, that have choreographed mechanics, so each time you're generally getting someone that has no idea what that mechanic is, hence wipe.
Unlike other MMOs where party finding was tied to the users on the server, this would lead to a player getting a bad reputation.
Here, not the case. So bad can keep happening.

Dungeons, yeah, you can generally figure out along the way, but Titan EX, Garuda EX, people coming in blind? you might as well throw the 90 minutes out the door.
DF is great for gathering people, but it does have its drawbacks.

I'd say try to find atleast one or two pals, I know it can be hard, but it will make your DF chances better.