At a distance of approx 5 metres, there is no discernible difference between MTP and Multicam (pattern is not as important as colour and contrast).
How does it fair a little further out than 5m .... say for example the range of a Taliban fighter with an AK-47? Does it still work well then? Having been on Salisbury Plain this week with 4 Mech, in various moments of extreme tedium, this was one of the topics that cropped up and one of the SO2s there - having been drafted back in to the field from DSTL / QQ (I forget which - I was cold and bored by this stage), apparently what we are getting is not what we origianlly ordered / wanted. Allegedly the company couldn't deliver the colour / pattern combinations we originally asked for so we ended up with a fudge solution.
Not sure if this is correct, and a bit of thread creep, but as ever, there are probably 2 sides to the story.