Let's get this straight, shows don't often have their best work at the first episode. It's just natural. At that point, the people working on the show still were experimenting with the elements and are trying to perfect it, and it doesn't usually happen on the first try, even if the show evolves to be amazing. Looking back at Frienship is Magic as an example, sure, it's one of my favorite shows of all-time and if it weren't for episode one, it would have never come to being, but the first episode had numerous flaws, the characters were only portions of themselves, there was some forced dialogue, and it feels like some things were just missing. Not knowing what else there was, though, I thought it was great and moved on. A pilot only needs to be good enough to get on the network and gain a following, and it can grow from there.
However, I can say that this episode was better than the Friendship is Magic two-parter, as it was a show that didn't need all the elements of something beautiful, thrilling, or whatever, it just needed to be funny. And it succeeded at that, giving us many classic jokes, starting with great ones like SpongeBob's morning routine, and ending with a reprise of the Patty making, while still introducing us to the now-iconic character. Going through it by each aspect...
First is the animation. While it was slightly rough and off-model, it was still very fluid that provided a lot of energy, and had it's own unique quirk. Then there's the story, well, plot thing. The idea with an episode in this season is that after a basic premise is made, they make up all the jokes that can tie into it and surround it with a story. It was interesting here. It was a creative and crazy way of doing something as simple as getting a job application. With Mr. Krabs and Squidward denying, they kind of get what they deserve when the anchovies destroy the place, and they realize just what they were going for with SpongeBob and how much of a gift he was, and it was nicely complimented by a mild action scene with a nice musical number from Tiny Tim. The humor was also very good, because when the memorable jokes like Patrick's terrible motivation "stick", they allow rewatch value with even the subtlest of moments given a subtle joke such as a smoke puff from the chimney or "I want my mommy Mr. Squidward" that you have only in the back of your mind.
Overall, this was a great way to start off the show and a window of what was to come for the future, and that's all it needed to be.
I think I gave it an 8.5, but I'm not exactly sure.