Also dived into the new league. Obelisks are fine, but not worth jumping back into just for them alone - it does feel you can get good loot quite easily though which is nice. My first obelisk gave me a full set of roughly appropriate rare gear, and each one you're getting a good few currency items too.
Got to say I haven't found the Melee changes amazing - it's a solid improvement for bosses/bigger enemies as you can actually dodge their attacks now, and the whole 'all melee attacks hit enemies in arc' sounds good in practice, but I'm not sure in reality.
The arc can sometimes be a bit inconsistent, and that stacks with accuracy as well which means your damage can vary quite a lot. It also seems that melee is a bit slower now (or maybe much more reliant on attack speed?). All it means is that area of effect/multi strike skills are still better, but that single target skills sometimes hit adjacent enemies.
Overall, it just doesn't make that much of a difference in a game all about spamming and chaining skills for screen clearing. I'm sure it's made a few pure melee builds a bit more viable and it has made boss fights slightly more interesting, but it's not as game changing as I thought it might be.