I don't mind it personally. Even besides just losing B4B, all my attacks in general just felt weaker in 4.0. Getting Riddle of Fire adds, in my opinion, some much-needed (Forgive the pun...) punch back to the Job. The increased damage output for its duration feels like a worthwhile trade-off for the temporary nullifying of GLs speed boost. It just feels good to use imo.

Certainly more-so than all my friends complaining about 4.0 MCH (Haven't had a chance to get into it myself though, so maybe when I do I'll similarly not mind it as much :P)