last night I got to play a Planescape game as a player character for the first time. (My second time should be Sunday, but we’ll be trying out the Open Legend system rather than using Dungeons & Dragons 5th edition.) We were playing an adventure from Tales from the Infinite Staircase, and we started with 4th level characters. I played as a bugbear mystic (using playtest rules for mystics), which was a lot of fun.
I did find however, that starting off at level four made it harder for me to have my head around all of my character’s abilities. I need to keep that in mind for when I run adventures myself. Last time I ran an adventure (a few weeks ago) we were starting at a higher level, and one player who’d never played before found it hard to get their head around all the things they could do at that level. I think it’s a good reason to start new players at 1st level, even if they’re playing alongside other players with higher level characters. It’s easier to learn your character’s abilities if you start off with just a few and gradually gain more.