For the most part that's about right barney. I rarely actually use his ultimate in my above deck but the times that I do it is generally a perfect scenario to do so and works amazingly well. Again, he's very versatile.
I also think people tend to sometimes play planeswalkers a little too carefully. Do I want them to stay on the board? Absolutely but a lot of times they can be great for stalling a turn our two while taking hits to save hp while I'm about to throw down a sweeper followed by a couple hexproof fatties. And they usually do at least something else useful as well and can sometimes just win a game outright.
I assumed emblems were permanent lol, all this new magic stuff is still crazy to me half the time lol. Maybe I need to get my head out of the 90s ;P
here you go all the rules on emblems
113. Emblems
113.1. Some effects put emblems into the command zone. An emblem is a marker used to represent an object that has one or more abilities, but no other characteristics.
113.2. An effect that creates an emblem is written “[Player] gets an emblem with [ability].” This means that [player] puts an emblem with [ability] into the command zone. The emblem is both owned and controlled by that player.
113.3. An emblem has no characteristics other than the abilities defined by the effect that created it. In particular, an emblem has no name, no types, no mana cost, and no color.
113.4. Abilities of emblems function in the command zone.
113.5. An emblem is neither a card nor a permanent. Emblem isn’t a card type.