I decided to make a list of short opinions for the newcomers. Posting this might even get the thread back on track, who knows.
Bowser Jr.: Initially negative, I like him a bit more now that the other 7 Koopalings are likely alternates and his playstyle looks interesting
Dark Pit: Why (and this is coming from someone who had KIU as 2012 GOTY)
Duck Hunt: Since we haven't actually seen any gameplay they could go anywhere but I did laugh when I saw them in
Greninja: Pleasantly surprised, looks fun to play. Will probably use as a "secondary main"
Little Mac: GOAT
Lucina: OK, shame about Marth being nerfed so she might not be as good as she could have been
Mega Man: About time, playstyle might be a bit off-putting (considering there aren't many dedicated zoning characters in Smash)
Mii Fighters: No idea which one to use for my Mii. Probably Gunner
Pac-Man: Saw this coming a mile off. Not really a fan of Namco so some of his references might go over my head and he's apparently quite slow/sluggish so that's a bit disappointing
Palutena: Default setup is a bit generic but her custom moves are pretty cool. If there isn't a secret taunt for the Kid Icarus stage to replace Snake's CODECs I will be extremely disappointed
Robin: Is apparently very good. Might look into him/her
Rosalina & Luma: Don't have much of an opinion about Rosalina but puppet characters are fine
Shulk: Stance dancing is cool and looks practical to use often. Is fast, hits hard and has long range so I'm probably gonna pick him up at some stage
Villager: Tree looks a bit unwieldy to use. Bizarre character overall
Wii Fit Trainer: I get the feeling a lot of people are going to play her incorrectly by spamming Praise the Sun and launching projectiles