I hated the hook ups from Schue's wedding. It made zero sense to any of the characters.

Quinntana was basically r*pe and was also reused Santana and Finn storyline but with Brittany involved instead of Rachel.

Finchel made zero sense

Marley couldn't make up her mind who she actually wanted to be with.

This is what I would have done

Please don't take my ideas

Instead of Quinntana I would have Pezberry instead. 

Santana and Rachel weren't really friends. neither were Brittany and Rachel. Plus Rachel doesn't really drink and when Santana is around Rachel you'll notice that Santana hardly drinks.

It would have made more sense for Pezberry than Quinntana, who are actually toxic and abusive around each other, and Brittany and Quinn were supposed to be friends as well. Quinntana's hook up made zero sense to both characters and made zero sense for plot.

Instead of Finchel, I would have Fuinn..

When Rachel isn't with Finn. He ALWAYS goes back to Quinn. It would have made sense for Fuinn to hook up over Finchel. 

Marley can't make up her mind which boy she wants, and she strings them both along which is wrong.

So instead of Marley meeting up with Ryder in the hotel room. I would have had it as Jake and Ryder instead.

This would allow Jake to come out as bisexual and allow both boys to realise that all Marley does is use them and string them along. and allow Ryder to also experiment too.

Klaine (If they did hook up at the wedding) like Finchel made zero sense. instead of Klaine I would

Kurt and Karofksy. but I would do this differently. I would have Kurt think it's Blaine but it's actually Dave, and they talk about them, and talk where they are with each other and what it means.

or Kurt would have Adam as his date, and they bring Elliot with them, and Elliot meets Blaine on the dance floor and then Jesse at the bar.