Well you can still get wyverns assigned after getting the key piece and they're a fairly fast task so you could just do them instead of wasting points.
Hi
Wyverns are doable, but I don't really enjoy them, their aggressiveness and damage output requires a bit too much involvement.
Camels, while not exactly difficult, are by far my least favorite and I don't think I'll go back and do a task of them.
All of that being said, the drops seriously need worked on. I think the biggest problem is all of the previous slayer tasks have received such a buff that it makes it hard to find a decent drop table for these new monsters as well, but ugh its so bad. Just make the unique drops actually good, and task only, and leave the common drops as shit, I don't see whats wrong with a boom or bust approach to slayer like it was in the old days. The weapons just don't live up to expectations though.