No spoilers!
I've got a nasty habit of having periods of recklessness with certain
characters, so I tend to roll up a lot. This leads to me playing
characters across the board, from your typical THUNK (Troll barbarian)
to some of the most fragile combinations out there ( I remember once
trying out a grey elven thief just for that reason). Obviously, the
abilities of these classes differs at certain experience levels,
drastically. At level one it's like apples and oranges. But (here's
where the title comes in) the ID, for me, is usually a nice indicator
of ability. So at times I mentally add the level of the ID the
character 'floats' at as a judge of power. Just throwing that one out
for comments.