I,m sorry if I'm off topic here.
Most of my chars (3 of 5) were really a kind of hybrid, and with ea build I looked at Fat. By using the Fat Head on my creature, it kept me from investing pts in it myself. Even with my pure DW warrior (#4), he proved to be invaluable, especially against Bosses. We would both tag team a boss, or singled out enemy, with RA. The creatures melee is not that high, but he can land a ton of blows before falling because of his 2000+ Health. Be you Mag, Rag or War you just need to get the health down to the trigger point and it's over. Sometimes this final blow would be in excess of 2500+ dam.(at higher lvls) I don't think the other creature classes can get any where near that. I could be wrong and usually so. It also seems IMO, (I haven tested this) that his lvl 10 is more powerful than the same lvl of Fat, if not higher lvl, used by the char.
But, as with most applications of the game, it comes down to playstyle.