Yes, the pet sucks. It's not supposed to be the focus of the class though, it's supposed to be a bit of dps. It's the beginning AA ability, compare it to what everyone else gets for beginning AA abilities for crissakes:
- Brawlers get a 5% run speed buff.
- Saders get a focus buff when they drop below 50% hp.
- Sorcs get a pet that gives them a tiny dps boost, or a tiny hate reduction, or a tiny cast speed buff.
- Bards get a reduced recast on their HO starter.
- Summoners get a short-term pet possess.
- etc.
Nobody gets super buffs, awesome dps, or game-breaking abilities for their AA starters. You shouldn't be expecting to be different.
As for healing ability, yes mystics lack there. It's a good thing that's not what the class is about. Mystics are about damage prevention, via wards and debuffs. If you cut the str, melee skills, attack speed, and dps of the mob you need much less in the healing department to keep a tank alive. What makes it through hits the wards that you should keep up, and anything past that you can heal up with your sub-par heals.
If a mystic isn't for you, by all means re-roll. Mystics aren't a typical healer, and complaining about how they aren't isn't going to get you anywhere. People seem to have a notion that things should change to fit their idea of the way things are supposed to be. Sorry, but that's not the way anything, ever, works.