Joris - some days, the best I can do is:
Mmm... nice
Mmmmhmmm... even nicer
mmeehh... not as nice
I do have to add though that it's a very good experience to cup/taste coffee/espresso with other people. It's like calibrating your taste buds. Sometimes it takes someone mentioning a taste to trigger it for you
Sometimes it also takes a while before you use the same taste descriptor. And even when you're very familiar with a particular coffee, you just never know what you hear from others that helps you identify yet another flavour
Apart from all that, it's more interesting and tons more fun to be cupping with other enthusiasts