Do you think the world is a naturally evil place?

No. It's not naturally evil. The human beings in it are generally rather underdeveloped spiritually, psychologically, and scientifically speaking, and that makes for a lot of confusion and conflict, but that shouldn't necessarily be called "naturally evil". Just, again, underdeveloped.

do you think it is worth living?

I'm not sure the physical manifestation has much of a choice in the matter. Seems we manifested in physical form on this planet at the behest of a greater force than ourselves, and there is a lot of documentation indicating that, similar to a prison sentence, if we try to "escape" this prison by, for example, killing ourselves, we'll just get sent right back with added time tacked on our sentenced for "bad behavior" (i.e. trying to escape).

That said, although life on this planet can indeed be likened to a prison sentence, it can also be looked upon as (and likely is more similar to) a grade in school that one has to go through before one graduates to the next level of education.

So is it worth living? Well, to say it's "worth it" or not is, perhaps, not really accurate. Regardless of whether it's "worth it" or not, life here seems to be more of a process of, again, spiritual evolution that's decided upon before we even get here, and it's decided upon by, perhaps, our greater self and possibly other identities - not our current, limited physical one.