You have to remember that the Smash DLC is for two different platforms and that each costume has a Wii U AND Wii U/3DS pack listed in the eshop. That cuts the actual amount of DLC in half right there, not to mention the combo packs, of which there are four for the characters (again, both for just Wii U and the combo) and I think six or seven for costumes.
Whether you wanna argue that 35 or so DLC is too much is up to you, but the average price of the DLC, excluding bundles, would be somewhere around a dollar, with the majority being spare change mii costumes. Moreover, fans actually ask for a lot of this crap, it legitimately can add tons to the experience for those who use it. Personally I don't care for any except the K.Rool costume and I bought that as a joke. It could be a lot worse, it could be a Naughty Dog game for example. Love most of their games but my god does Sony milk the shit out of the multiplayer.
You should check out my YouTube channel, The Golden Bolt! I review all types of video games, both classic and modern, and I also give short flyover reviews of the free games each month on PlayStation Plus to tell you if they're worth downloading. After all, the games may be free, but your time is valuable!