Earlier quoted context omitted.
Instead of hotels, put 4 houses as quickly as possible so there are no houses left for other people to build. Only upgrade to hotels when you can afford to put the houses that will become available onto another of your properties. Other people's sets are worthless to them if you own all the houses. Combine this strategy with the fact that the highest ROI on most properties is 3 houses, and you have a winning strategy…
That last line is the rub here. I used to play Monopoly as if my life depended on it. Now I don't, because no one will play Monopoly against me anymore.
There are a bunch of great, easy to understand, easy to play games that are much better.
(HN search might find a few, there have been several threads before. Board Game Geek tends to skew toward the more complex end, but there's probably good lists of great family games.)