You should play the cards you are dealt.
If you don't like your hole cards in Texas Hold 'Em (popular Poker variant), you aren't allowed to ask for new ones; however, you are entitled to fold your hand.
In my last game, I had to be aggressive early to find a second city tile on a small map. If I knew the map was always fair (and thus guaranteed me a nearby second city tile), the game would not have been nearly as exciting. The cost of this particular really fun game is that next time I might end up with an "impossible"* map that I may end up folding. I agree that some maps are unfair (at least to us mortals), but it does make for a more interesting game not knowing what hand you've been dealt.
*I put impossible in quotes because there are those experts...