I had a coffee today that had to rate as the worst I have ever had....it was so bad I actually couldn't drink it and returned it for a Tea. When asked what was wrong with it (it's difficult to say, everything), I tried to explain. The 2 young lads were very good and showed me the beans they used (a lot of robusta in them and the odd peaberry along with a few wrinkled old Arabicas). Was this the cause of the problem...possibly and possibly not (the robusta quality actually looked OK, I know a contradiction in terms).
A little bit more questioning elicited the problem (i think), as I had had a fair, but not great coffee there many many months before. The 2 lads were new and trained by the outgoing staff on a very nice twin group electra. They didn't have a backflushing disk (although one of them had worked at Costa and knew what it was). They had NEVER backflushed the machines with anything in at least 5 months!!!!
I asked if were they still getting crema and got some blank looks, I said the brown foam on coffee when pulling an espresso...."nah" one of them said "we never get any of that". It's quite sad...the young lad did write down: blank backflushing disk and Puly Caff....but really, i think the chances of it ever happening are remote.
The saddest thing of all is that this goes on in far too many establishments and many of the general Public probably get a completely wrong impression of real coffee. I can understand it, as instant would often taste better than the coffee that one can sometimes find.