The free teleport is not as practical as it sounds. Its not instant, you shoot a void missile in front of you, and then you have a brief window of opportunity to teleport to the missile. Use it too soon and you only moved like 3 yards. Use it too late, and you get nothing as the missile despawns after traveling a few yards.
The no cast pushback can be useful in PVP (not by much, interrupts and silences are the real way you deal with healers), but in PVE its all but useless, seeing as the tank is gonna be the one hit almost all the time, if someone is hitting you, something has gone horribly wrong. And its useless for all the void elf melee players.
And the 5% boost to damage and healing is not permanent, and its not a toggle. Its a proc, with a 33% chance to trigger, and an internal CD of 60 seconds, so in practical terms, over the duration of a fight, it brings a 1% increase of damage and healing, making it more or less the same as the other racials.