We were in Portugal this past spring. I do a lot of research before travel and that helps a lot. We did use the Multibanco ATMs a few times. They were in English and we had been warned to watch the prompts by a Facebook Portugal group that I followed. If you were using Euronet, or similar, yes, probably set up to mislead you, or at the very least to make a lot of money, but that would likely be the same anywhere in Europe using that type of ATM.
I tend not to use taxis for a lot of reasons. We use public transportation a lot wherever we travel. In Lisbon, we took the convenient metro right by the airport exit. We actually had A LOT of problems with Uber in Lisbon and Sintra (lots of no shows, or would accept the drive and cancel after 10 minutes). Our three taxi experiences which were to the bus station in Porto, the bus station in Evora and to the airport in Lisbon worked quite well. We really appreciated our taxi driver in Lisbon. We were late to the airport because we waited a long time for a couple different no show Uber drivers. His route to the airport was efficient and knew the best place to drop us at the airport and even told us which direction to go in the terminal. Also the ride was quite cheap. Maybe 25 euro is my recollection. Every hotel/innkeeper we asked about Uber (in Sintra, in Lisbon, in Porto, in Evora), said, do not use it, they are not reliable, which was our experience. In talking to folks about Uber in Europe and probably some places in the U.S. is the platform, itself, less so the drivers.
Your airline experience is unlikely unique to Portugal. It probably has everything to do with the airline chosen. I've never flown a budget airline, but if I did, I would be expecting them to be a stickler on baggage.
We thought the people in Portugal went out of their way to be friendly and transparent. The only thing that came close to a scam was the "self appointed" parking lot attendants. We didn't mind paying a euro or two for someone that pointed to vacant spots. We thought it was resourceful and we chuckled a bit. I would also guess that there is less crime/break ins because of these guys being in the lot.
The few things that annoyed us about Portugal, were the strikes, lasting for weeks, making it more difficult to plan, and lines probably due to not having a system set up to accommodate what seems to be exponential growth in tourism. e.g. Buying a timed ticket for the Belem monastery means nothing. You simply get into a rapidly growing line with no sun protection and wait, at least an hour, twice. One for the monastery and one for the church. Even there, I'd done a bit of research and talked to other travelers so we were prepared as well as possible.
I understand when a trip doesn't go as planned. In our travels, we felt cheated by an inn in Taormina, my daughter was pickpocketed in Barcelona, on the same trip, one of my daughters dropped my camera in Vienna. My very wise, low key husband, said each time, "Do not let this ruin your trip".