I own both a Wii U and a 3DS and I don't have a problem with these ports.
I've never had a problem with ports in general whether it has been on PS4, Vita, XB1, Wii U, 3DS, NX, etc. We know new games are coming anyway and it's not like main teams are wasting their talent and resources as the ports are often done by 3rd party studios like Tantalus Media, Bluepoint Games, Sumo Digital, Sanzaru Games, Armature Studio, Straight Right, etc.
I just think this shows that it would make sense for Nintendo to secure a shared library between their next handheld and home console. Wii U and 3DS already have many games that are more or less similar in gameplay and/or visual style.
Animal Crossing: Amibo Festival (Wii U) - Animal Crossing: Happy Home Designer (3DS)
Donkey Kong Country: Tropical Freeze (Wii U) - Donkey Kong Country Returns (3DS)
Dr. Luigi (Wii U) - Dr. Mario: Miracle Cure (3DS)
Hyrule Warriors (Wii U) - Hyrule Warriors: Legends (3DS)
Kirby and the Rainbow Curse (Wii U) - Kirby: Planet Robobot/Triple Deluxe (3DS)
Lego City Undercover (Wii U) - Lego City Undercover: The Chase Begins (3DS)
Mario & Sonic at the Rio 2016 Olympic Games (Wii U) - Mario & Sonic at the Rio 2016 Olympic Games (3DS)
Mario Kart 8 (Wii U) - Mario Kart 7 (3DS)
Mario Party 10 (Wii U) - Mario Parti: Island Tour/Star Rush (3DS)
Mario Tennis: Ultra Smash (Wii U) - Mario Tennis Open (3DS)
Mario vs. Donkey Kong: Tipping Stars (Wii U) - Mario vs. Donkey Kong: Tipping Stars (3DS)
NES Remix (Wii U) - NES Remix (3DS)
New Super Mario Bros. U (Wii U) - New Super Mario Bros. 2 (3DS)
Paper Mario: Color Splash (Wii U) - Paper Mario: Sticker Star (3DS)
Pikmin 3 (Wii U) - Pikmin (3DS)
Pokémon Rumble U (Wii U) - Pokémon Rumble Blast/World (3DS)
Star Fox Zero (Wii U) - Star Fox 64 (3DS)
Super Mario 3D World (Wii U) - Super Mario 3D Land (3DS)
Super Mario Maker (Wii U) - Super Mario Maker (3DS)
Super Smash Bros. (Wii U) - Super Smash Bros. (3DS)
Yoshi's Woolly World (Wii U) - Poochy & Yoshi's Woolly World (3DS)