I think people tend to be a bit unfair on Tilke. What people do not seem to appreciate is that he has to work to a brief and to modern pc facilities and safety standards. It's not like some random billionaire hands him a blank piece of paper and says "here you are Mr Tilke build the new Nordschliffe!"
Even on the brand new tracks, built from scratch such as Bahrain, Turkey, Shanghai etc, they already knew what they wanted. Shanghai even insisted on the circuit layout being modeled on a Chinese character!
Tilke is actually a very good architect, heck he'd have to be! He's one of only 2 people the FIA trust to mould tracks to modern F1 standards. He's already proved that without restriction he can produce very good layouts.
People think he will ruin Donington, but these people aren't listening to what is being said are they? Simon Gillet has already noted that any changes from Redgate to McLeans would cause uproar, and so the actual circuit profile there is not going to be touched save for ripping up a bit of grass and inserting some new run-off surfaces.
The only big changes are going to be fairly insignificant to the circuit layout, a new pitlane and paddock will be built on the inside of Starkeys straight, where the "Dunlop" bridge is. The Esses "might" be removed to make for a longer straight, and lets face it, it's not exactly a classic bit of race track.
And a new half mile loop will leave and rejoin the current GP layout at Goddards, and this don't forget is likely to include a "Craner style" corner.
All in all, these modifications do not spell bad news, the character of the layout will remain in tact.
To me the real questions are budget, planning permission, and local road infrastructure. Obviously the local roads need some major improvement, but it seems that Donington have also secured rights to other land and are seriously considering park and ride etc.
And the real reason that Bernie has given the contract to Donington is that he believes that they will do what is asked of them, where as he knows Silverstone either can't or won't.
If Donington fails, then there will not be a British Grand Prix.