Can't really argue with that to be honest!
Well you can, and I'm about to.
For a club of our size a reasonable expectation would be to be flitting between the PL and the Championship. Perhaps a bit more time in the Champ on balance.
Thus, I would suggest that it isn't unreasonable to expect us to make a final once in a while and actually win a PO final every now and then.
So, in the original list I'd have the following down as. "Failure"
1993 - FA Semi v Wednesday - Lost
1997 - Play Off Final v Palace - Lost
2003 - Play Off Final v Wolves - Lost
2009 - Play Off Final v Burnley - Lost
2012 - Play Off Final v Huddersfield - Lost
2013 - Play Off Semi v Yeovil - Lost
And the following down as "did well to get to that stage" based on how good we were at the time (and 2003 is arguably the hardest one to place)
1998 - FA Semi v Newcastle - Lost
2003 - League Cup Semi v Liverpool - Lost
2003 - FA Semi v Arsenal - Lost
2014 - FA Semi v Hull - Lost
2015 - League Cup Semi v Spurs - Lost