Hi. and Yes. There is a difference between being "point blank honest" and being "gracefully acceptable." Ex: You are at a function and the band is hideous. The set is over and they are milling about. It would be obnoxious to state you thought they better go take some guitar lessons. Your opinion... One that may hurt their feelings. This may have been their first time playing together. A number of things you have no clue about. Instead you could say, it was a unique sound they had and you hope it takes them far in the business. This is not a lie. It's still your opinion, in a round about way, and no one has their feelings hurt. You and I know you're not going to go out and buy their album, but they don't need to know. I hope this helps. It's much better to be courteous. Have a nice night!