I'm not sure I agree that the Cab Room is not as good as the rest of the AmpliTube package, but I do think that it is
much harder to learn to use.
It's not hard to flip through a list of IRs and finally settle on the one that seems to sound best, but it
is hard to juggle all the parameters in the Cab Room to try to get something that you like. There are multiple cab models, separate speaker models (that can be mixed and matched), multiple mic models, multiple positions for one or mics that can also then be leveled differently in the mix ....
I think it's so much like "real" engineering, calling for the same kinds of engineering skills and experience, that it overwhelms many of us.
I've set up little looped recordings of some multitracked power-chord-type riffs in my DAW so I can quickly flip through different settings in AmpliTube, with the stomp/amp and Cab Room settings in different instances of the AmpliTube plugin so that I can use a 100% AmpliTube chain, or I can switch out the Cab Room portion for an IR loader and compare. And, sure: if I've got good IRs (bad IRs are a different matter!), then, sure, I can flip through those rapidly and find something that sounds good. And, sure: it can take me longer to get to the same place in Cab Room -- unless, of course, I've already figured out some good cab/speaker/mic/placement/balancing presets for what I like there, which is basically what an IR is anyway (i.e. a "preset" that captures everything about a given configuration of cab, speaker, mic, etc.)!
I think IKM would benefit from having some more (perhaps many more!) video tutorials on using the Cab Room. If I were just a kid and I didn't know at least the basics (which is about the maximum of what I know!
) about mic'ing up cabs and capturing guitar tones in a studio situation, I would be pretty lost in the Cab Room, I think.