It was a gut punch because many refused to believe what posters were telling them all along, that rentals don't historically return top prospects, regardless what twitter-verse was saying.
This is a good return for the Pens for a rental. Historically, rentals return a late 1st + a prospect of Pono/Koivunen's caliber. Pens got a mid-2nd (or late 1st if Canes make SCF), 2 good prospects that are close to NHL ready, another prospect, and a decent NHLr. I get that it's "quantity over quality", but rentals don't historically return quality like some were asking.
In the past, the Canes have given up guys similar to Koivunen/Pono like Nic Roy and Eetu Luostarinen in deals and fans weren't impressed because they didn't have the big names, but in the end, those players ended up being steals for the teams that got them.