There was an interesting stats piece from someone on twitter (Dan Kennett i think?) and it shows the xG (expected goals, based on some algorithms) for Huddersfield to concede last year and he was suggesting the stats pointed towards Ward actually being pretty below average against what would be expected i.e. conceded more than he should have been, even though they did on paper have a tight defence.
One season of xG data is probably not enough to make a firm decision on Ward. Bit if we watched his games as well and the eye test gives the same impression of him then fair enough.
As for Ming v. Karius - we've seen Ming for 4 or 5 years now. We know what he is now, a good shot stopper but the remainder of his game is shaky so he'll have good and bad spells.
I think its a good idea to test Karius and see whether he can be better, i'd prefer if it wasn't the CL games he plays but we need to find out for sure that he is shit before we go sign someone else