1. Mirage only roots, not stuns (similarly to warden 3rd skill). Target can still shoot and use items in mirage skill
2. Mirage has to put himself into a bad position forward, in most team fights he will die if he does this.
3. Mirage is not a late game carry, wraith is, she deals much more dps.
4. Mirage has to physically target the skills, aim. Wraith does not.
5. Wraith ult runs through walls after target, not the case for Mirage.
6. Mirage does not have a proper escape (his ult doesnt count because it channels 4s and require an actual target to do that to) hence his only hope is to be offensive in team fight and kill more people before he dies. Wraith literary has the BEST escape in the game.
Remember guys, when looking at certain skills, you have to look on the entire hero overall. This is not CS GO where each person has basic health and can just chose weapons himself, each hero has an actual kit you have to work with.
That said, Mirage is a decent team hero, I would call him a mid game carry, similarly to pocket.