Being as strong as Super Saiyan 3 Gotenks would have gotten a bit more of a reaction.
Not necessarily, SSJ3 Gotenks is pitifully weak by current standards. He was super powerful like five sagas ago. A lot of characters have shown up since surpassing him, several make Goku look pitifully weak.
I have no idea why people have an issue with Trunks being that strong in a series where Krillin can have his head touched and become stronger than Saiyan saga Vegeta.
People keep trying to find excuses just so Trunks can't be around as strong as Goku. Beerus calls SSJ2 Vegeta utterly pathetic and SSJ2 Trunks pretty good "Oh but he was always mean to Vegeta". He pushes SSJ2 Goku back with his guard up and SSJ3 Gotenks can't budge Copy Vegeta with his guard down "Oh well Goku was holding back" even though they
never said Goku was holding back and they
did say Trunks was holding back.
People were saying Trunks can't be as strong as "X" because Goku and Vegeta only got as strong as "Y" by the Buu saga. Yet the manga has SSJ2 Trunks 10 years after the Cell Games being as strong as SSJ3 Goku 14 years after the Cell Games and he was given magical training weights, trained in 10x gravity, had a sparring partner, the ROSAT and trained with Whis. So now you've got people saying "Oh well it's because he's a half breed and Zenkai boosts" and things which nobody mentioned before.
The anime and manga present a similar thing. SSJ2 Goku fights SSJ2 Trunks. Trunks is able to "push" Goku. Nobody says Goku was dicking about. Goku turns SSJ3. Trunks powers up a second time. Trunks attacks him with his sword. Goku takes him out. Obviously in the manga they were equal and in the anime they aren't but there's absolutely no reason why Trunks couldn't be around as strong as SSJ2 Goku in the anime.
Even in the manga he can't be that far off SSJ3 Gotenks if he's equal to current SSJ3 Goku.