I just wanted to know wether the Oversized Two Weapon Fighting, Two Weapon Blocking and Two Weapon Defense feats are worth taking.

Oversized - Of course it depends on the playstyle, in my case I have started a Valenar Elf pure Tempest and plan to take this just because of double wielding scimitar of doom. Aside from the fact that I will take it just for the role, how good a choice is it? And when would I take it? What cases are there where this feat would be a good choice? Human with extra feat Khopesh prof? Why would I take it in what general cases and why not?

Two Weapon Blocking - Are the two extra DR when blocking worth it? In what cases (not)?

Two Weapon Defense - 1 AC and 5 PRR are not worth it, are they?