I think for Nintendo it goes

A-Team: Mario (2D and 3D), Mario Kart,  Smash Bros., Animal Crossing, Pokemon, Splatoon (top selling staples)

B-Team: Donkey Kong, Luigi's Mansion, Fire Emblem, Kirby, Mario Party, Yoshi, Paper Mario (solid selling IP)

C-Team: Metroid, Pikmin, Kid Icarus, Punch-Out!, Mario Strikers, Wario (Sell OK, support titles, can be a long time between sequels)

D-Team: F-Zero, Star Fox, Pilotwings, Wave Race, Advance Wars (semi-retired IP that Nintendo pulls out of their hat once in a blue moon).

I agree with Rank A, though Splatoon could be one of those IPs similarly to Kirby where each installment sells less gradually. Kirby was once a franchise that broke 5 million units like Splatoon did. Honestly, it may be too early to rank Splatoon. I believe you may have forgotten Zelda.

I agree with everything else too. Metroid is probably B-Team though, I mean the hype for Prime 4 has been unprecedented. I'm tailored to believe this will easily beat the first Prime in terms of sales. Especially with the rise of FP games as of late. Pikmin could be B-Team too. Every game has broke a million units.

I think a game should be able to break 5 mil to be considered "B team" material - especially for a first party dev like Nintendo. Selling 1 million is nice, but probably isn't going to push a lot of hardware.  We need more points of data on splatoon - yeah, it could go up or down.

"A" games need the potential to break 10 million - maybe even more than that.

I think they have enough big franchises left to carry the console (Pokémon, Animal Crossing, Smash Bros, 2D Mario, etc.). With the Switch getting decent support from Japan and Indies and with Nintendo focusing on the Switch as their only console starting next year we'll see enough big games on it. Nintendo was never focused on one console before and their combined (HH + HC) game output is quite tremendous.

I said they currently have the best-selling console. I was obviously not talking about those amazing Switch sales from 2014... not denying that the PS4 has the highest install base (I mean, there's a huge graph on the front-page to remind me every day haha!) 

In that case, a lot of these games move down to C-Team. 

• Mario Party does not sell 5 million units. It had a breakout on the DS and 8, but those are outliers. On average, Mario Party sells 2 million. The 3DS games should've at least sold 3 million for me to believe that's possible imo, but Mario Party has turned to shit since Hudson left. Series ain't getting 5 million ever again.
• Yoshi sells 1-2 million. First two games sold the best, but even then couldn't break 5 million.
• Fire Emblem sells like a million. Awakening was a one hit imo (and that sold 2 million)
• Kirby games as of late haven't even got 2 million. Even the DS games couldn't break 3.

While it's obvious that Switch success is exceeding Ninty's expectations, their position isn't tricky at all, users and many 3rd parties are loving it. and despite the gae library still small, SW sales and attach rate are excellent, new games can only better a situation that's already good.
Sure, Ninty could ruin all with too many mistakes, just like any other company could ruin its own business too, but right now it doesn't look like they're doing too bad, they did some mistakes and they're still doing some of them, but these aren't too hard to fix.