I think it depends on what you're after. I play in 2 bands at the moment, my old band have a female singer and we go for more pop/rock stuff, playing covers of Pink, Katy Perry, and lots of weird stuff too, where I need many many different tones to fill the space, as we are only a D/B/G setup, the other band is a 6 piece (D/B/V/K/G/G) that mainly requires metal guitars, with some effects here and there.
I can do it all with my 6U rack and the 4x12 cabs that are in both rehearsal spaces (I have a H&K with Greenbacks in the place for the Pop/Rock project, and I borrow a Marshall 4x12 with G12t75s on the metal thing). It's easy to set up and very versatile.
As I am amplifying with a VHT2502 I also get the punch and warmth of a tube rig and get the right feeling in the room.
I do still have the Shiva head, but hardly using it now, it's just too complicated to lug around, organise, set up.
If I had the roadies and techs to care for it, I'd probably play a Herbert or an Ueber for the metal gig and an XTC Classic for the pop/rock gig, but I don't wanna spend the cash or time on optimising FX loops, switching, power supply, cabling etc.
So yeah, maybe it's only 90% as good, but for me it's good enough.