That's the rest of Season 2. It has it's hiccups, definitely (the only damn tree frog on the whole damn island, tub of ranch dressing), but it's awesome.
And Season 3, which has easily the best run of episodes on the show and of nearly any series I can think of, is not the best season at all because half of it sucks. The first six episodes suck. Every other episode until the final rundown are bad or just mediocre. But the last six episodes? ****ing amazing. The episodes that aren't every other episode? ****ing amazing. Season 3 is a joy. I can barely imagine a time before Season 3 and all that it brought to the table. For Seasons 4, 5, and 6? I can. Season 3? It's impossible to forget about.
And that's not saying 4, 5, and 6 were bad. I can hardly believe some of the characters introduced in Season 4 weren't around forever already. It's a really good season, some people's favorites. Season 5 was huge in scope, but faltered early and faltered late, but its core was so strong and it's unbelievable how quickly we, the audience, took to some big moves. Really quickly. And six? It has a lot of flaws. That's really all I have to say about that.
So, yeah, my original point, that quitting in the middle of Season 2 as a valid move, still stands. No, most of the characters were falling out of awesomeness by that point. Jack was a crying whining mess. Kate was a complete disaster. Locke was losing his mojo. Charlie was all about drugs and Claire was all about the baybeh. Sayid was a shell. Michael was annoying. Hurley was getting depressing. Everyone's baggage was just growing bigger and bigger. They were not a joyful group of people to be with. Season 1? There were some hang-ups, but everyone had a role and some heart. Middle of Season 2? I can't blame you if Sawyer was the only character you liked (especially if you got to The Long Con, =D).
But you jumped off a bit too early.
But hey, maybe you're in the right. Season Six sucked and a lot of people were heartbroken that things didn't go the way we wanted or how we hoped. Not even about how the mysteries would be solved or how theories would be dealt with, just... wrapped up cohesively. Given proper story resolution. Alas.
I don't know. It was a fun show and a lot of the top ten episodes come from later seasons. It's a show that often would suck for a period of time before it jumped into the biggest boom. The worse it got in the moment, the better the next thing to come would be.
And thinking like that, maybe Season Six will be a blessing. It sucks so much that it influences a cultural renaissance of epic proportions across all mediums changing our very lives for the better.