Have you never actually seen these acts? Because neither Mo'Rockin nor Off Kilter are dime a dozen rock bands, both were very unique attempts to put a modern spin on an old genre.
Singling out the good doctor here, but seriously taken aback by the number of people who POST ON A DISNEY FORUM but have never taken the time to see the atmospheric acts that make WDW more than a collection of rides.
I'd definitely seen Mo'Rockin' (didn't care for them much) but I don't think I've seen Off Kilter. I've seen one of the British bands, though I don't know which one. I've seen the drum and fife group in the past and loved it; IMHO, that's the biggest loss here.
Though I don't really appreciate the tone that suggest I or others have ignored the entertainment. The reality is that I don't live in Florida and I don't go to WDW anywhere near as frequently as many on these pages. I typically go once every year or every other year for a week or less. So, I'm probably spending maybe an average of about 5-8 hours a year in the World Showcase. With my young children, I've been doing the Kidcot stations and Agent P a number of times plus eating and shopping, so it's not like all this time is devoted to just watching street performers.
I rarely make a point to schedule watching a particular act, but if one is going on when I am there, I will stop and watch. My recent trip, we watched the juggler in Italy, the balancing guy in France (we were waiting for our table at Chefs) and the mariachi band in Mexico for a bit. The last time I was there we watched the acrobats in China and Mo' Rockin'. We also tried to catch a bit of the Candlelight Processional from outside the theater since it was around the holidays and went to some of the "holidays around the world" stuff.
But, no, I haven't seen a ton of the acts. I couldn't unless I went a lot more frequently or sacrificed a lot of other things that I like doing at WDW. If you want to suggest that it makes me unqualified to comment on this, then so be it. To me, the Berber group sounds like an upgrade for Moracco, the flag thing actually sounds interesting and different (but could easily suck) and the Celtic group seems like a perfect fit. Despite my defending it, the lumberjack thing seems stupid to me, but if it's there when I'm around in Canada, I'll give it a few minutes to watch and determine if I like it. If I don't, I'll move on.