how good is the psychic bloodline with a sorcerer at
low levels thinking of trying it out
There is a lovely guide to bloodlines here. Psychic gets away with a very high rating I can't disagree with.
I think it's a pretty good one.
The bloodline arcana is really cool and can help boost your survivability early on (when casters are most squishy) by letting you wear armor.
On the other hand, be sure to always have a Potion of Remove Fear with you...And mind the penalty to concentration checks, you do not want to have to cast defensively!
The rest of the bloodline is quite good too: you get a lot of bonus spells, especially with Undercasting Prodigy, Psychic Strike is really nice and Sense Motive has its uses if you're going to be the party face.
It's good enough it knocks Sorcerer into a tier 1 class. Toss on False Priest and then you're really cooking.