I don't mind getting some weak powers per se, but the problem is that these cannibalize things the wizard will be wanting to do.
Let's take the conjuration ability. +2 armor bonus. But if you're a smart conjurer, you're casting Mage Armor. You could not, and have an extra spell - but until you're level 10 it won't be as good as that level 1 spell, and you'll be tempted to cast it to get the best AC you can.
If it just stacked on top of mage armor or something - then yes.
Same deal abjuration bonus. OK, so if you're not expecting fire, th en the bonus is fine. But if you are, unless you're a retard you'll cast the real spell anyway.
I feel these should stack with their "obvious" spells or otherwise give benefits that don't cannibalize the usefulness of the spells you'll need to cast...