Having rewatched this episode, I found it really good. It was indeed sad that Scrappy didn't feel wanted, but he was kind of silly to trust those train robberers... "But what do you expect from a little pup?" ;P
Y'know it's funny (In a sad sort of way) How the harder Scrappy tries to impress, the less he actually does. Growls from a monster can't scare him, but a few harsh words (Even if they were meant for a mosquito, but poor Scrappy had no clue) from friends and family are enough to send him into a self-imposed exile. Scrappy seems to have been moving around a lot in his life (New York, Globetrotting with the gang, Dusty and Yabba) And we don't really see him interacting with others his own age a whole lot. So all he really could do was to get approval from his guardians and maybe make some memories too. You're forgetting the end. What with Dusty telling Scrappy how they couldn't get along with out him, and Yabba giving that musketeers speech (Even that's gone bittersweet nowadays-I just realized that Fred and Dusty share a voice actor-Frank Welker. What was it Fred says about Scrappy again? "Don't look at IT, Daphne! We promised to never speak of IT again." Sigh. A lot can change in twenty nine years.) There's nothing funny about running away, or being the unwitting pawn in a railroad robbing scheme and then dumped when the baddies don't need you anymore (Scrappy was literally in tears) though there was one moment on the beginning when Yabba bellyflopped on Dusty. Actually, this whole episode is hard to watch taking in all consideration everything that's happened, but I took comfort in the end, which seemed very decided non-hater-fodder. Wow, that was long.
"Is it weird that the most serious incarnations of these characters are the ones I have the most trouble taking seriously?" -Me, on the new HB Expanded Universe "That's how you know you're in the future-when 'Scooby' and 'Apocalypse' are next to eachother in the name sentance without a hint of irony or sarcasm." -Me, on Scooby Apocalypse
Scrappy has always been a young sidekick, and who has never really been liked by much of the Scooby fandom. there are movies where he is good - Scooby doo meets the Boo Brothers for instance- but in recent years its simply been easier to portray him as a bad guy