What defines a great endgame experience for you?

For me, a great endgame experience should give me a reason to play every day, an incentive to play activities on a daily/weekly basis, and the activities themselves have great rewards

While it remains to be seen how storytelling will turn out at launch, my interest in Anthem is more into whether it will give me reasons to keep playing even after completing the critical story path. And given its a looter shooter, its in the best interest to have an engaging endgame experience.

Probably they want to avoid implying the game ends?

When gameplay is it's own reward.

The only sort of end game content I'm really interested in is NG+

This. I liked dropping in on Destiny when I had a spare 15-20 minutes to kill, and just pounded evil aliens into the ground. So satisfying. Didn't really care about progression (was level capped anyway) or loot.

Oh, and Arena Mode. Can still be PvE, that's fine: The Witcher 2, NieR:Automata and God of War 2018 all had PvE arenas. Not to mention ME3. I even enjoyed the arena in DAI Jaws of Hakkon and was bummed I could only run it twice. ARMAX ARSENAL ARENA FTW!!!

EDIT: Another "Oh, and ..." / Assuming this is not already in Free Play mode: Jetpack obstacle courses, ala Batman: Arkham City. And since this is co-op, can be 4-way races. Some courses would be no Storm javelins allowed, others would be special Storm challenges, like you have to lighting bolt some obstacles out of the way.

And as a variant on that, treasure hunts, in the traditional sense. Start with a clue, find the treasure, gives you a clue to the next one, etc. Preferably not timed though, more as an incentive to see the world.

There's no reason a looter shooter shouldn't do NG+.  Pretty much the archetypal loot game is Diablo, which was big on NG+.

I don't expect it, but I don't see any reason not to argue for something better than the standard MMO stuff.

Ooooo! You said the no-no word. Oooooooo

If gameplay fun im fine repeating missions on higher difficulties, exploring, pugging SH an hopefully there is specific loot only tied to a certain SH or boss that gives me something to aim or try for, i find a boss with no specific loot tied to him/her/it a very sad boss indeed. So have the missions with a difficulty that only comes available at end/elder game, something like Divisions challenging unlocking when you hit 30 but hopefully with alot more missions with it available.

Difficulty an tactics, im no exactly worried though i do feel the difficulty in there SP is a joke that said there Online stuff ranging from SWTOR to MEMP is actually no bad an, for me, has a nice balance between challenge an fun.

With all the effects an elemental dmg we been seeing something akin to Destiny's Nightfall could be nice with mobs being resistant or weak to types with emphasis on teamplay for setting combos, like fire does zero dmg but primes them for huge dmg from another type so yeah im hoping the combo's just aint for show an ppl need to use that shit on higher difficulties

Accessibility. I have played World of Warcraft pretty much on and off since Day 1 and one thing I have really thought was a good idea is how they have changed how people can access the later parts of the game. I enjoyed the evolution their grouping content has taken over the years with additions like group finders for dungeons and then raids and then the different tiers of content so everyone can experience it if they want to. They might not have the best of the best gear, but at least everyone can experience it. Arbitrary restrictions cause people to leave the game because they feel there is nothing to do and when people start leaving because of that there is no guarantee that they will ever come back.

Regularity. The other thing is that whatever type of content that will be added to the game there should be some regularity to it. From it being things like the Weekend Events from Mass Effect 3 or Seasons in Diablo 3 there doesn't need to be a major update of content, just something that gives players objectives for things to do. I know with Mass Effect 3 when the weekend events stopped it was only a month or so before I stopped playing ME3MP or when I finish a season with Diablo 3 I stop playing until the next season I play the game for the gap can be large enough I skip coming back for some seasonal content.

One of the better additions to DA:I was the trials, basically modifiers your asking for BaGGs, hopefully something similar can/could get added to higher difficulties, elemental resists, more dmg while airbournef etc etc, it certainly spice encounters up