MindxKiller
Explorer
Except that's only an argument so you can try to compare apples to apples.
There are other great feats out there which a Berzerker could take which don't overlap with and semi-obsolete Frenzy but which can't be compared mathematically as easily - Sentinel, Martial Adept, Resilient.
Actually Sentinel does overlap with Retaliation, and Martial Adept is a horrible feat, but yes, resilient is a good one. That still doesn't address the fact that without GWM you're going to be outclassed at the one thing you're built to do. Nor the fact that even with GWM you barely do 7 more dpr than the alternative PM barb, yet you take a significant penalty to do so. The whole point of the barbarian is to be an incredibly durable damage machine, yet if you go berserker you're less durable and less damaging than a totem barb polearm master.