Hold'em Indicator questions for cash games

I just started using Holdem Indicator, and it shows win odds and pot odds. My question is, if the win odds are higher than the pot odds, should I always stay in a hand? Sometimes, it seems very unlikely that my middle pair will be a winner on a scary board, but the pot odds will be like 15% compared to 23% or something for the win odds. I really don't understand how to use this information properly, and if anyone can shed some light on it for me, I would much appreciate it. Thanks

Another thing that I'm not sure about is how can I use the Went to showdown and Went to showdown and won stats of a player to my advantage? And, since the agression factor stat measures the amount a player bets and raises against the amount that he calls, should I bluff raise or reraise against the very high agression factor players more often since they don't call nearly as much as bet or raise? Should I consider bluff shoving against them?