I don't understand why people are hating on Rebuild but not Mine...
The reason is simply this:
When you play on a board with Mine, there are a handful of things you can do. For example, on one and the same board, you could either go for Mine/Fools Gold, or Chancellor/Stash, or Workers Village/Poor House, or Transmute/Duke, or Big Money, or... I don't know which of these would be best, and the fun is you can find out yourself. On a board with Mine and no support for it, there still are a bunch of ways you can play.
This is not the case for boards with Rebuild. As Rebuild is extremely strong, skipping the card likely means losing. So if you want to win, instead of deciding which tactic to go for to do it, you just decide which support for Rebuild to get. Instead of deciding which cards to combine with each other, you decide which cards to combine with Rebuild. Instead of chosing a strategy, you chose a Rebuild strategy.
For this reason Rebuild makes the strategic choices on boards it appears on very narrow, leading to much less entertaining games - the fact that the card effect itself is boring adds to it, but isn't the main reason.