In what sense? Not choosing the shortest path for example?

Oh, had that happen in Canada! Drive was supposed to take 10 minutes, 12 minutes in it doesn't look like we're close, "where are we going?", "Oh, didn't you say you wanted the scenic route?" Of course I never said that, ride ended up almost triple what it should have been :/

The taxi that picked me up at the Munich train station didn't start the meter. When we arrived at the hotel, the driver demanded a fee which seemed quite high for the short distance we travelled.

I don't speak German and had been in Germany for only a few hours at that point, so I didn't know for certain that I was being scammed. In fact, I still don't. As far as I gather, taxis are supposed to use their meters to calculate the cost of the trip, but perhaps there are exceptions I am unaware of.

There's a lot of things I find questionable about Uber and its business practices, but the fact that they tell you the price up front is definitely a positive contribution.