There is a huge difference between a few seconds appearance (which I don’t mind) and a prequel being entirely about the character…
If by “a few seconds” you mean three whole movies, then sure… A few seconds…
I thought you meant TFA appearance. As for PT, yes McGregor did a fine job with acting. However, that unfortunately doesn’t change anything for me. I would by far prefer Obi-Wan’s backstory (and the whole OT backstory) to be left alone.
In general, prequel to any film is inherently doomed to fail as it competes with an imagination of every person that saw the original film.