Well, I use the RH450 with an RS212 and an RS210 cab in a 10-piece band with a loud drummer, three horns, two keyboard players, and a loud guitar. We play mostly larger private events in larger venues, from hotel ballrooms to 3,000-seat theaters and even outdoors festivals with 100,000 attendees. The RH450 sounds great at any of those (admittedly, with PA support in the larger ones). So I would agree that the RH450 "Is what it is" -- and for me that is a great sounding amp that is portable and allows me to avoid lugging around an SVT and an 810 cab. Maybe to you, an RH450 does "sound like arse," but were I to hear your rig at gig volume, I might think it sounds like a wet fart in a hurricane.
As has been repeatedly proved, everyone has different tastes. Had they not, we all would still be playing Leo Fender's original P Bass design through 410 Bassman combo amps.
I'll also add that if you have to crank your amp, your band is probably too damned loud to begin with.