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Let me explain why I don't like the Avenger skill:
1. You spend a skill point on it instead of learning something else.
2. To use it, you need to spend resources and build a structure.
3. It's not really feasible to use the Avenger effectively in the early stages, and as Major Whirlwind already mentioned, while attacking one castle, another can cross the path.
Added 9 minutes later
Oh, I forgot to mention that I prefer playing as Talanar (on Fury). His luck skill starts to improve after level 12-14; before that, luck does drop, but I try to improve it later. Does anyone know the approximate magic resistance provided by the Unicorn aura? Based on my experience, it seems like it only gives 15%.
Added 9 minutes later
Oh, I forgot to mention that I prefer playing as Talanar (on Fury). His luck skill starts to improve after level 12-14; before that, luck does drop, but I try to improve it later. Does anyone know the approximate magic resistance provided by the Unicorn aura? Based on my experience, it seems like it only gives 15%.