I think any soap (or shampoo bar) is gentler than shampoo -- that's actually the reason why I use soap. Shampoo dries my hair too much.
I don't do deep oilings, but I've noticed that to get my scalp clean enough I have to lather twice as a matter of course and if there's any buildup on my length (from aloe vera gel, in my case), removing it generally takes a third lathering and extra effort to work the lather through the length. Whereas with shampoo, just having the suds run down the length was quite often enough to take care of minor buildup issues. That says a lot about how gentle soap is compared to shampoo.
But I agree with Flor -- an acid rinse is a must. The alkalinity of the soap makes the cuticle scales stand on end and if you don't counteract that with something acidic, you'll end up with a tangly uncombable mess!
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