They should lower the wait time on the easier raids. Going for those achievements would take months considering you can only fight another one every 3 days after you first summon it and getting the chance of attacking an easy raid is lucky if you can find one still alive.
The hero abilities should be more descriptive. Like the rage ability should say that you do X % more damage while you take X % more damage. Judging from what I've seen so far, it looks like the devs rushed the game and didn't have a chance to put in everything they wanted. The lv 5 fire temple upgrade not giving anything new is a fine example.
Why is this a grind fest game now? You need to play the same mission like 30+ times just to get 3 stars. Really? I know you don't need to do that but come on. I don't like the way this game is going. i think the last good epic war game was #3 imo.
The menu scrolling thing is kind of a pain during the game. Perhaps use hotkeys or show all the units available but change the images to black to indicate that we do not have necessary requirements to build it?
I just got 1 component for a card. Just need to wait another year or so and I finally finish 1 section of the components and then another 3 or 4 years and try for the other 300+ pieces...
 "Utopian Mining")
 "Legacy of a Thousand Suns")
 "Epic War Saga")
 "Nuclear Outrun")
 "Fracuum"){kind=icon}
 "i saw her standing there")
 "Help! It's the Unfinished Shadow Game")
 "Pretentious Game")
 "Nano Kingdoms"){kind=icon}
 "Tyrant")
 "Clear Vision 5")
 "Awesome Planes")
 "The Godfather: Five Families"){kind=icon}