What you may have read in other forums is what suits the other forum's product sales and marketing. There has been lots of discussion of IR length as it pertains to emulating guitar cabinets, here, on TGP and elsewhere and you won't have any problems with the Torpedo. If you are looking for reverb and space simulation, there are lots of great options that work perfectly with Torpedo.
As you can download WOSIII and BlendIR, you can easily listen for yourself.