Get this straight. Jonny pre-injury was the best fly half in the world. He was a metronomic goalkicker, capable of bossing a game better than anyone, and showed time and time again he possessed flair (see 2002 try vs NZ..)
Jonny post injury is still capable of that. We've seen he's still very classy, and can kick well. What we also forget is that with him at 10, there's no need to pick lumps outside him in order to bolster the defence, because JW is still the best tackling 10 in world rugby.
However, whereas the JW of 2002/3 was consistently fiyah, now he throws out one good performance next to a couple of ordinary ones and also can be abysmal.
His goalkicking has become increasingly unreliable; out of hand he was never outstanding but now he's just poor; and without a Will Greenwood at 12 he really misses out on the creative gamereading side and is thus 'boring' since Flood doesn't have the experience to boss him around.
--------------------------
Cipriani is an outstanding talent. I think if he was fit he'd be a shoe-in to the England 10 shirt. He's quick, creative, and has an excellent kicking game. One thing I noticed is JW tends to try to kick end-over-end which gets less distance. DC I've seen put in some monster punts and for me distance > accuracy.
ATM, Cipriani is easily a better 10. However, he's got a long term injury to recover from, we'll see how he manages that.