On the whole, 'Scooby Doo and Scrappy Doo' is one of the weakest of the Scooby Doo shows. It did though have a very watchable first season, with the best episodes actually being very good and only one episode being below average. After the first season, the show very quickly went downhill and never really got better despite some watchable shorts here and there. Shaggy and Scooby were always the most interesting characters and didn't mind that they were main protagonists, did mind though that the other protagonist is one of the main reasons as to why Season 2 onward did not work.
"Scrappy's Birthday"/"Sir Scooby and the Black Knight"/"Scooby in Wonderland" was one of the more watchable triple bills that are listed here, after most of the previous ones being very mediocre. Namely due to it boasting one of the show's best shorts and because neither of the three are weak or among the worst shorts. Two of the three shorts are very flawed and there are still a good deal of the usual faults, but again there are also things that have improved.
The best of the three shorts is easily "Scooby in Wonderland", with its only faults really being the flat animation and the overuse of Scrappy. It is however very cute, has some actual amusing humour (more than usual and quite fun this time), the setting is very colourful and anybody who is a fan of 'Alice in Wonderland' will love the references. Which are affectionately done. "Sir Scooby and the Black Knight" has a great setting, starts off really well and the Black Knight is suitably creepy.
Nice to see some insight into Scrappy. "Scooby in Wonderland" also boasts one of Shaggy's best and funniest moments of all the shorts and the first time he has shone up to this point of the season, that being "eat this stupid". Voice work from all involved is spirited on the whole, Casey Kasem and Don Messick are great as Shaggy and Scooby. Have always liked the theme tune, which is catchy.
Having said that, flaws can be found. "Scrappy's Birthday" is paper thin, ocer-stretched and rather dull, while also being light on laughs, too cutesy occasionally and not making sense (Scrappy sure does mature fast here for the first born). "Sir Scooby and the Black Knight" does become repetitive in the second half, with the action being too predictable trio versus villain-like and the ending is a dumb cop out.
Moments of cuteness in "Scrappy's Birthday" aside, Scrappy is overused to main character effect and very annoying from his negative traits being overdone, his ability to make things worse than they already are obvious throughout. The animation is very rushed looking and flat with very irregular character designs. The music is nice on its own but doesn't always gel with the action, some of it on the repetitive side. The dialogue tends to be too corny.
Concluding, not great but watchable. 5/10.