I didn't mention it in my earlier post, but this gen introducing online play was really big in bringing me back to the series. Knowing that I could get Pokemon I want even if my friends didn't have was great. Though it wasn't until Gen VI that really took advantage of it to make a complete living dex, haha.
My thoughts on its music is that it could be a bit hit or miss, but the hits outweigh the misses. It may not have been as great overall as Gens I, II, and V, but at least it was another massive improvement over III that it made.
Overall I think it had a great selection of new Pokemon. Easily the best set of starters in the series and it gave some old Pokemon some new life with evolutions. Several of the legendary's designs don't stand out to me though, but that's been the case for every Gen except I and II for me so it's not a big deal.
Using Smash as an example is terrible, as the gameplay style remains the same regardless of whether it's single or multiplayer (1v1, Battle Royale), or the use of items. Not to mention, items don't really change the style. Pokemon focuses on 1v1 during single player and then GF focuses on Doubles while ignoring . To clarify, I'm not saying that Doubles shouldn't have some competitive focus, but it's ridiculous to focus solely on Doubles and then ignore Singles as another possible metagame.
Smash's single player modes love free for alls with items on. The use of items greatly changes how the game is played, they become a priority to chase down whenever a good one shows up, the flow of the match is completely different from one with items off.
Smash is a fine example. Single player focuses on a completely different format that will not prepare the player for competitive play.
This is starting to get very off topic though. Whether or not you like the chosen format, my point has simply been that Game Freak does care about the balance in these games.