What these dudes are telling you is spot on. When I first got my Axe-fx II, my main purpose in acquiring it was to record music.
There was one big problem before. Even though I had worked with audio before, and I had certainly played a lot of guitar in my day, I had never mic'ed up a cab and recorded it. Ever. Not once. So IRs REALLY didn't make sense to me, and I was left wondering, when I had purchased 500 frickin' IRs from redwirez, how in the hell I was ever going to find a sound I liked. So I talked with a bunch of dudes and read as much as I could with the clear goal in my mind that I was shooting for a modern hard rock and heavy metal type of sound. There were many different opinions on how to get where I was going, but the more I learned, the more I started to realize that less was really more. I mean, I was mixing like 5-6 mics from 2-3 different cabs chasing that "Grail Tone" that I'd heard about. It was absurd. I still wasn't happy. I then realized that for most guitar tones that I had heard recorded, they were USUALLY recorded very simply - SM57 and Royer 121. Occasionally they would throw something else in, but I learned that as far as staples go, IRs of cabs with those mics made me a lot more happy.
Things have really changed in past 8 months or so - more useable IRs, studio mixes, ultrares - believe me when I say it's a hell of a lot easier to find a good IR now than it was before. For what I'm after, OwnHammer High Gain Essentials takes the cake for me - almost every IR sounds good, and there's limitations so I don't spend my time jacking around in MixIR or some other nonsense program trying to figure out how much "2 feet from the back of the cab" I can mix in to finally get the cab thunk where I need to with the IRs I mix up. Really, the recipe that works best for me is as follows:
1. Diezel 4x12 Chinese V30s with an SM57 - usually position 2 or 3.
2. Mesa 4x12 English V30s with Royer 121 (for which there's only one position)
- I usually use the 5881 tube preamp files that he loaded up - I like the way they sound.
After that, very little EQ in the DAW. A low pass anywhere from 8-12 kHz and sometimes a high pass, MAYBE a slight cut in the 250-500 range.
Just read as much as you can though and have a clear goal in mind for what you are trying to sound like - you will get there!