Good enough that you'd make an arcane trickster with a sorc template? The Rogue1/Wizard19 route looks pretty good.
I only played over the weekend (finished ch1 with a 2h fighter) but from what I've seen so far - if you want to make a "pure" wizard who will not only buff/summon but also nuke stuff without having to go "nova" and then rest afterwards I'd do the following:
Lvl 1 alchemist, vivisectionist
You gain: free +4dex, +2dodge AC mutagen for 10min, both effects stack with everything else and 1d6 sneak dice, take accomplished sneakattacker for another 1d6 and you have enough sneak dice to qualify for Arcane Trickster, add to that a bunch of lvl1 spell slots where you can shove some stuff where caster level doesn't matter like True Strike for instance. Then take 5 Wizard levels until you qualify for AT.
You end up with plenty of sneak dice that you can apply per ray of frost cantrip all day long, when you need bigger cannons, scorching ray, empowered scorching ray, hellfire ray etc (basically every spell with touch attack) can apply sneak dice and deal additional damages to vital organs, Sense Vitals lvl2 spell can add another 5d6 sneak eventually. As far as I can tell you can sneak attack even Undead in this game.
The first feats should be Point Blank Shot and Precise Shot to make your rays hit.
As far as sorcerers go, I assume a similar strategy can work with Sorcs too, although vivisectionist synergizes better with INT based casters (though there is a INT based Sorc too). One level of Vivisectionist gives you better things than 1 lvl of Rogue imo.
I guess draconic bloodlines offer some good bonuses so even a CHA based Sorc can work well, either take INT 11 or 12 or ignore INT for you don't need those alchemist spells anyway.
