Yes, he is pretty good in PVE modes as well. Can clear proxima up to maybe 10-15 easily and clears any SL stage he’s eligible for with ease. If you don’t have a better option he can also hit 100k abx. His main utility is in PVP tho.
IW Thor is the stronger uni, no question, however Ragnathor gives you a free p-card at mythic and it’s a decent uni. You just have to weigh up the pros and cons.
I’d say Ragnahulk is a stronger character than Ragnaloki as his uni gives him a heal that rivals Wolverine. However, Ragnaloki is a pretty good universal villain, which is a very good thing to have for SL purposes.