I think you are being slightly harsh, Mammutly.
If every perofrmance this season were of a similar standard then, personally, I would have little problem with Hughes.
I take your points regarding certain tactical aspects, it is glaring that this is not his strength - at all - but he could argue that this tactic was identified as the best way to beat Hamburg (he'd probably be let down by the fact that we haven't shown any other options throughout the season, but still).
Hughes tonight would escape my wrath.
I am seething about the constant burying of Sturridge's City career and share your concerns regarding tactics, but there are far more glaring opportunities to point out Hughes' failings this season and he has the get out cluase tonight that he identified these tactics of 'pure manic effort' as the best option (even if you don't believe him).
My problem is that this sort of performance is very much the exception, rather than the rule. If he showed the ability to motivate the players to play like that and put that effort in when there isn't a European quarter final at stake, I might actually be inclined to defend him.