The EuroNet ATMs in Germany are actually pretty alright! I use them all the time and recommend them to visitors as well because they are widely available and still among the more official and hassle-free ATM brands around here. (They have a simple UI, support many languages and never ask for extra fees, as far as I’ve seen.) But it might be different in other countries and dependent on the origin of the bank card, of course.
I believe the reason they don't ask for extra fees is because the exchange rate they offer is so bad (unlike your typical bank ATM that offers the correct exchange rate but might charge a Euro or two for foreign card withdrawals). Admittedly, that might be fire for visitors from the eurozone.
If you are withdrawing the same currency that your bank account is then yes I believe euronet is ok. But try to use them with bank account in foreign currency - it´s not really clear to the user that they are accepting such a terrible exchange rate. At least that´s my experience.
