Siege of Vienna was the hardest to get a gold medal, until I realized that almost everyone dies if you just wait for the structure to collapse on its own, then it takes one shot to get the rest of them.
Seems to me that the Titans, while well balanced, are outclassed when you get others to max rank and spells/mana at max. They are just too slow to be effective and their damage output isn't that great, since there is only one of them. Challenge 2: Get a bunch of regular creatures and keep on attacking the bomb, then, when it is about to explode, cast shield. Challenge 3: Get lots of high damage creatures, wait for you mana to near max, the go in, shield/rage/berserk until he dies (only 1-3 castings, depending on difficulty). Challenge 3: max out mana as best you can (without the boss reaching/killing you first) then send everyone out with shield
I thought that this game could have been better if it had been longer and a bit more difficult, I will hopefully play Shift 2 this weekend.
P.S. I loved the ending, but I figured something like that may happen.