It's easy for people to forget now, but when I made my Raijin video guide over 4 months ago, the overall consensus BY far by most Youtubers, and people on the forums was that Raiden was bad, and only Thunder Wave was even viable. 90 percent of the community had completely written off Raijin early on because he didn't have a midscreen juggle, even though in my opinion he was still solid back then too.
The whole reason why I had uploaded a Raijin guide in the first place is because back then ALL of youtube Raiden strategy & kombo guides were only for Thunder Wave.
I had played thousands on matches on ranked, and very, very few were Raijins. Especially during the first 3 months. Most players i had fought against had often said things like "wtf, I never seen Raiden with those attacks", because... again, very few Raijins were active on Ranked.
I had even fought Dalphanate early on back when he would only use Thunder Wave; after we ran good back and forth sets, he admitted to me himself and said, "maybe Raijin is stronger than i thought. I might start using him more."
Lo and behold, shortly after that he started using Raijin many of his uploads.
At the end of the day, I'm happy that more people are using Raijin now. Both Thunder Wave and Raijin are solid in my opinion.