Don't really accept that Hauritz was only successful because the Poms were circumspect against him. He was attacked a couple of times and he bowled good areas and the occasional very good ball. Often when people attacked him they got themselves out.
England where indeed cricumspect, that Ashes batting line-up without KP didn't have any truly good players of spin.
In the first test, he was garbage in the 1st innings, getting 2 cheap tail-end wickets, plus i'm sure you have forgotten that lucky dismissal he got againts KP. In the second innings he bowled well - but was helped significantly by a wearing pitch, similar to what Suliemann Benn did to ENG in Jamaica early this year.
In the second test, after he injured his hand in the 1st innings - he didn't disgrace himself gettting 3 good second innings wickets. But he didn't exactly exert any pressure & what happened in the 2nd innings sort of proves why he can't be depended on to be part of a 4-man attack. As you may remember Johnson ATS was @ rock bottom, Siddle wasn't economical & Hilfy was carrying the attack. No sense just being accurate if you aren't going to get people out - as Warne did is 2005 when the pace trio also had gone haywire.
In 3rd test he was solid in his only innings, didn't disgrace himself maintained his usual accurate line. But again ENG sat on him too much, really have to feel if he was bowling againts IND he would have been smoked.
He's succeeded against teams that play spin well in ODIs as well.
You really can't compare how he bowls in the two formats tbf. His strenght is his accuracy which in ODIs thats invalubale (plus in the past year he has adopted a very attacking outside off-stump line). So in ODIs where batsmen try to get after him, having that accuracy & attacking line gets him wickets - thus making him a very solid ODI bowler.
In test he is accurate but lacks penetration, he never going to run through a side. Only a wearing 5th day track as we saw in Cardiff is when he's likely to be at his most dangerous - which isn't good enough to make him a must pick in a 4-man attack.
Hauritz is basically the 2009 version of what Peter Taylor was in late 80s & early 90s.