Aggressively statted doesn’t necessarily mean having more attack than health. It’s just a minion that you put in front which is able to trade with multiple other minions. It also depends on the effect the minion has.
Spelljammer is a good example. Its 3 mana 2/4 but due to the nature of how the card works you want to put it in front so it trades and dies so your enemy doesn’t benefit from the card draw. It having 4 hp means it will usually take a general and a 2 drop hit to kill it, leaving the 2 drop on 1 hp, which is more important than leaving the 2 drop on full hp and the enemy general taking 4 damage as if it were attacking Void Hunter for example.
Talking of Void Hunter, Blaze Hound is more aggressively statted than it precisely because it doesn’t die to one general hit but requires more resources to get rid of.
Another good example is Shieldmaster. It’s a 4 drop which you slam in aggressively to trade with all the enemy 2 drops and even higher drops. 3 attack is enough to kill most 2 and 3 drops and having 6 defense and provoke means enemy is forced to deal with it, usually in a sub par way.
If we’re talking about aggressive cards that have more attack than health, the best example is probably Dioltas. Specifically in Lyonar, you really don’t want to kill it on your own turn because enemy will get the tombstone which can just hit you for 20 the following turn. So it’s usually safe for Lyonar to just put the card in front, and if it dies, whatever, if it doesn’t, it has potential to clear a pretty large minion.
It all depends on the context. Now, I might be wrong in the way I see things but this is how I got to interpret it. I see aggressive statted minions as ones you can just slam down in front forcing the enemy to make bad trades which results in you getting tempo and eventually winning of it.
When it comes to minions with higher attack then defense in the vacuum, they’re usually just not good because they tend to trade 1 for 1 which isn’t worth it even if the minion you’re trading for is higher cost. And if you want to use them for hitting face, they’re still not necessarily good because after doing such they’re on even lower hp and even easier to deal with, where you’d rather have less face damage but decently sized minion on the board remaining. But again, this is just vacuum and things can work differently in actual context.