I believe The Beatles: Rock Band came the closest to being perfect. Eveything about that game was just beautifully done and the only things missing was Pro Drums, an option for Keys, and a few more Beatle songs (Hey Jude, Strawberry Fields Forever, Yesterday etc. etc.)
I respect this, but always had trouble with portal 2. It has some great parts but is also way too long.
Portal 2 has grown on me more and more over the years. Now when I replay Portal, I’m disappointed that it’s not more like Portal 2. The story, the puzzles, the overall mood, the environmental design, the characters, the damn soundtrack—everything’s just perfect.
It is definitely a bit longer then it absolutely needs to be. I personally think it paces itself well, but I can see your point as well.