I was able to purchase the DLC, but I can't download it or the general software update. When I try, I get an error saying it was getting no response from the server. And it's not my internet, because an internet test in the Settings confirmed that's working.
So after all that bitching that the characters were boring, a waste, and how you didn't want them in the game, you bought them anyway. I'm not terribly surprised since you've done similar things numerous times in the past with other games. I guess I don't really get the point. Way to vote with your dollars.
it doesn't feel like Nintendo really gave a crap when they did Ryu's stage since there's no stage interaction and the arena is just 2 sets of floating platforms. Eh.
I'd argue the opposite as it's as true to the original stage as possible. If Ryu is going to be put in the game, Suzaku Castle is exactly the stage I'd expect. I don't know what kind of interaction you expected. There isn't a ton of stage interaction in the Street Fighter games, notably some background signs and boxes getting destroyed.
Anyway, some thoughts
I haven't tried Lucas yet. I expect him to be very close to his Brawl iteration. I chose Lucas as my CPU opponent when I played as Roy, who is awesome and significantly more awesome than he was in Melee (and Project M for that matter). He feels familiar since I play mostly as Lucina, but he's different enough that I'd like to get to know the ins and outs of his character. I tend to play Lucina on the ground really close which translates well for Roy though I try to take advantage of her length in the air which does not translate well for Roy. I like his Awakening DLC redesign.
I like Ryu. He's going to take some getting used to. I keep messing up his Street Fighter input moves because I press Special instead of Attack. I can see his extra Final Smash being a thing for all characters in the next Super Smash Bros.
It's nice to have Dreamland 64 back. I'm definitely looking forward to Peach's Castle and Hyrule Castle whenever they're released. The Miiverse stage is just Battlefield, but you know, a free stage is a free stage. I played Roy vs. Marth on it and one of the background posts was "I have never played Fire Emblem =("
I suspect there will be three more DLC characters: the winner of the ballot, Wolf, and maybe another returning fighter. Mewtwo is considered separate then we got two returning fighters and a new one today. I hope Ice Climbers, but Snake would be my choice is Sakurai still can't get them to work.