Omnisphere isn't great with pads...
Because it's great with everything! It's a be all, end all synth, and actually delivers on that promise. It is (especially since 2.5 and the hardware synth integration) the best VSTI ever made in my opinion. My desert island instrument. If I don't know how to start, I always load up Omnisphere first. The rest comes later.
Trust me, most everything synthesized you can think up can be done with Omnisphere. It's a DEEP DEEP synth and requires a couple of years (yes that's right) to truly get the most out of it. On the surface it's already great, but once you dive down into it's depths, it is miles beyond what any synth can do.
This is of course my opinion, mind that. But I stand by it. The thing is mindblowingly creative.
The only thing it can't do is modular... but I never missed that. I use the Modular V for that, but it's not my workhorse synth in any way. More like just a fun distraction (however, dat bass!!!).
(The choirs are a secret weapon, by the way. Some of them are really good for basic choir work, and they sound fantastically bombastic!)