It is not broken.
I just did a straw man parse.
Without the point in it, I got 24 procs on three minutes of bashing Straw Man, gives 8 procs per minute.
http://i.imgur.com/uUkzLcE.jpg
With the point in it, I got 39 procs on three minutes giving 13 procs per minute.
http://i.imgur.com/xjzpcOt.jpg
An increase of 5 procs per minute. Definitely worth it!
Nevermind my low dps, I only bashed the strawman with BfA in defensive stance and gear I had equipped so bad tanks could share agro with me. Its not like the straw man parse goes any faster in dps gear and frenzy. ^^