Burning Hands may be good, but I detest Thunderwave. I refer to it as "ringing the dinnerbell"I always liked burning hands and thunderwave. They are close range and get multiple bad guys. Most wizards do not like to be that close, but they come in handy.
As stated, polymorph is excellent for offense, defense and scouting - though too many people forget that the mental stats are affected too.
People forget about it because it doesn't matter unless you're trying to, I don't know, pick locks or scribe spell scrolls while in the form of a giant ape. Stats only apply to ability checks, and the sorts of ability checks your friends might make while in combat are usually the ones that are boosted, rather than hurt, by being an enormous tower of muscle.
I'd probably don't give you every detail if you use polymorph for scouting as an animal with int 1. I'd say, you saw a few orcs or a large number, but I won't give you exact numbers.
That's your prerogative as DM, but let me remind you that the Intelligence stat is not a measure of what we call intelligence in common English. In 5e, the Intelligence stat refers to learned knowledge - history, religion, etc. Every PHB description of an Intelligence skill is either recalling lore (by vast majority) or making logical deductions based on knowledge. Intelligence is "book smarts."
Wisdom, in comparison, is "street smarts." What you're describing falls somewhere in the Perception and Survival zone, both Wisdom.
This is why most Beasts in 5e have low Intelligence and high Wisdom. They are not book-learned, but they are smart. As a concrete example, real world studies have shown crows to have one of the highest IQs in the animal kingdom (behind humans and on par with primates). Crows can absolutely count, solve puzzles, play tricks on others, etc. Their Int score is low, but their Wisdom score is good. Higher than a commoner, in fact!
So it would make more sense to say that the Beast forms with low Int would not recognize magic symbols for what they are, couldn't read, etc. But simply noticing how many things there are is definitely Wis.
maybe IQ is the average of WIS and INT.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.