Im going to chime in here because this is something that just came up for me. I tried this stuff like 3 years ago and really thought it was a good blend but I wasnt blown away...
... but years later it seemed extraordinary. I had the same experience, and not because it improved greatly with age I would guess. I tried some the other day and decided it was a good thing I didn't try it five or six years ago - I wouldn't have gotten it. This is going to sound a little over the top but, I believe this is a tobacco (which is WELL worth smoking) that benefits from context.
While it's not at all a tongue-burner it isn't the best rookie blend, either. This is one english blend I'm glad I did not
try when first starting out; and I am doubly glad I did try it after accumulating a background in how a range of english blends can present themselves in different pipes.
I found Commonwealth fascinating in a way that would have evaded me until I had first understood:
1) a "hit you over the head with a cricket bat" blend (Mississippi Mud)
2) a light, nuanced blend (Squadron Leader)
3) a sweet oriental that needs finessing (Early Morning Pipe/Red Rapparee) and
4) a marginal latakia punctuated with turkish tobacco (Skiff).
Commonwealth is the place to go to understand the difference between Cyprus and Syrian latakia
as discussed at length by GL Pease. The volume of seasoned Cyprus leaf in this blend demonstrates its softness and sweetness with nary a sharp edge.