The worst boss is definitely Trendula. She is the reason I gave up on the game the first time around. I have whipped her arse tonight though, and I'm cracking on at a good pace. The thing that makes Trendula so difficult is that there are very limited opportunities to damage her if you're not just chucking spears at her, and she has a one hit kill move that knocks you off the walkway to your doom. Highly irritating if you've spent the last ten minutes whittling her down.
Still, I managed to crack the strategy tonight.
Call of Duty 4 - 1000/1000
Call of Duty 2 - 1000/1000