The quality of the coffee depends on the technique used (and who does it). Yes, most decaf coffees suck, but there are some very good you can find. For example, Arpeggio [1] is for me and few people I know the best of all Nespreso coffees. In specialized coffee bars you can get amazing decafs.
[1]: https://www.nespresso.com/us/en/order/capsules/original/arpe...