Aside from Tricky Colour and Rafa's judgement, I'd put it in more of a positives/negatives/grey areas way;
Positives: Draws away to Russia, France and Italy in qualifying. Away draws in difficult venues against tricky Eastern European sides with similar resources/player pool to us: Slovakia, Bulgaria, Montenegro. 100% record in qualifiers against 4th and 5th seeds; Cyprus, Georgia, Armenia, Macedonia. Comprehensive 4-0 playoff victory against Estonia. Friendly wins against Colombia, Paraguay, Italy, and Bosnia. Nations Cup victory. Generally solid defence, went on a 13-game unbeaten run, and went eight games without conceding in 2011. Huge improvement compared to previous managers with arguably better resources. Favourable record in the last four years when compared to countries with higher-profile players and stronger traditions in European football, i.e. Romania, Belgium, Serbia, Turkey.
Negatives: Losing three out of three in Euro 2012. Home draws against Bulgaria and Slovakia. Home defeats against Russia and France. Losing friendlies against Poland, Australia and Norway. Poor ball retention in many games, stagnant starting XI since 2009, too many squad places ‘assured’ to limited players, not enough chances given to younger players. Squads generally selected with a heaver emphasis towards ‘continuity’ rather than form or ability. Paul Green.
Potential grey areas: Was qualification for Euro 2012 as big an achievement for Trap, given that the draw was relatively kind? Could, say, Andy Reid have made much of a difference to those costly dropped points in the 2010 qualifiers? How much of a factor was Trapattoni, and those ill-advised comments, in Steven Reid’s international retirement? Could more have been done to coax Stephen Ireland on board? Would a change in formation have yielded better results, or would it have necessitated the dropping of too many key players? Are the young players being ‘ignored’ by Trapattoni actually much of an improvement on the incumbents? Is Seamus Coleman actually a midfielder or defender? Are central midfielders actually told not to look for the ball or to pass it accurately, or is it a failure of their individual technical ability? Are full-backs under instruction to play it long and not cross the half-way line, or is it a failure of their individual technical ability? Is miscommunication really as big an issue as the media play it up to be? Were the Euro 2012 defeats more down to bad tactics/selections or individual mistakes from normally reliable players? Is there a clear plan for the future, particularly with regard to formation and the addressing of weaker areas, i.e. full-back and central midfield?
To me, it seems like there are more positives than negatives, but more grey areas than both, which reflects the fact that more people are divided on Trap than most other managers bar Staunton. Your perspective on the grey areas will generally inform your opinion on Trap.