I’ve had a lot of awful regular coffee and some very nice decaf. Human intervention always steers the final flavour of the coffee (picking, process, roast and especially…roast). All coffees taste somewhat different, that’s why we buy different ones.
Regular coffee limits how much I like to drink, but choices in decaf don’t really make it a viable alternative to the variety available in regular coffee. But, I have gone through decaf stages, especially when a work colleague had sensitivity to caffeine.
So, in short, not all decaf leaves you wanting in the flavour stakes, but you will certainly be limited in choice. And most decaf is darker/espresso oriented.
(EA process/sugarcane decaf have usually been my preferred options).