Hoping Ash doesn’t lose the ability to teleport to objects/through glass, there’s a few shortcuts that rely on that.
Should finally be able to make use of weapons with combo gimmicks now instead of having them reset to 0 if you cast an ability that makes use of a pseudo-exalted.
Might be worth building him to farming relics and then selling the prime junk/sets you get from those relic runs if you don’t already have have a loadout that you like using for those. He is one of the better warframes for this and Thermal Sunder is nice to have on the off chance a capture mission turns into an exterminate.
As for fun, that depends on how you like to play. Thermal Sunder on Gauss works fine for nuking content outside of ESO if you have the requires mods/arcanes, and don’t mind spamming 3. He’s only really fast in the tilesets that are more open/less complex, otherwise you’re going to be slamming into walls a lot.