I cannot recall the last time this happened. I think mostly because I make certain of my facts before venturing an opinion. The nearest I can think of is being pleasantly surprised by albums and books I had doubts about. Seth MacFarlene of Family Guy fame did a swing album a few years ago called Music is Better Then Words and it was very good, likewise Jamie Cullum’s latest album Interlude was a very pleasant surprise to find out how good it was. I was very impressed by him using the original lyrics for the tune now more commonly known as A Night in Tunisia, which is the title track. The only other recording of the song with those lyrics that I know of is an early Sarah Vaughan recording with Dizzy Gillespie, the composer of the song.
There are a few artists I have warmed to over recent years such as Sonny Rollins, Grant Green and Courtney Pine whom while I appreciated, they didn’t really do it for me.