Is World Youth Day good or bad?
Um... well, no. Not the way they're doing it. 
Condom wrappers everywhere, immodest clothing... I think pictures might express the truth about it, and you can make your own deductions.
Overt public signs of affection?
/126_FreeCondomsWYD02.jpg)

/121_WYD05-16.jpg)
Handing out condoms by the thousands...
/126_FreeCondomsWYD01.jpg)
Teenage girls and boys sleeping in very close proximity to one another, not being separated?
/121_WYD05-19.jpg)
/224_WYDTorontoLux01b.jpg)
Rainbow vestments?

/102_RainbowHabits02.jpg)
Rock 'n Roll music...

Liturgical dancing? 
/119_WYD05_02.jpg)
False ecuмenism...

Tatooing?
/119_WYD05_07.jpg)
Let's just draw some eyeballs to the wrong places, shall we?
/139_RatzingerDevotees02.jpg)
/139_RatzingerDevotees01.jpg)
Way to wear rosaries, man...
/119_WYD05_10.jpg)
Um... yuck?
/119_WYD05_04.jpg)
/270_WYD02.jpg)
/270_WYD02.jpg)
/270_WYD01.jpg)
Nice hair.... um....
/121_WYD05-14.jpg)
As if this isn't enough, they change the stations of the cross. Compare the two here:
 The 13 New WYD Stations of the Cross:
   1: The Last Supper
   2: The Agony in the garden
   3: Jesus before the Sanhedrin
   4: Jesus before Pilate
   5: Jesus is whipped and crowned
   6: Jesus carries his cross
   7: Jesus helped by Simon of Cyrene
   8: Jesus speaks to the women of Jerusalem
   9: Jesus is stripped and nailed
   10: Jesus and the Good Thief
   11: Jesus speaks to Mary and John
   12: Jesus dies
   13: Jesus is buried
  The 14 Traditional Stations of the Cross:
1 - Jesus condemned to death
2 - Jesus takes up His Cross
3 - Jesus falls 1st time
4 - Jesus meets His mother
5 - Jesus is helped by Simon
6 - Veronica wipes Jesus' face
7 - Jesus falls the 2nd time
8 - Jesus speaks to the women of Jerusalem
9 - Jesus falls the 3rd time
10 - Jesus is stripped of His garments
11 - Jesus is nailed to the cross
12 - Jesus dies on the cross
13 - Jesus is taken down from the cross
14 - Jesus is laid in the tomb 
So, the honest answer is.
WORLD YOUTH DAY IS BAD.