Strong Bad's Cool Game for Attractive people is a ncie point and click game. Each episode is very unique. As an adventure game you may find yourself stuck at times. Other times I swore up and down I had done everything then I redid everything and it turned out I didn't.
If you like the webseries Homestar runner there's a lot to love here. You learn a lot about the characters and they're each well represented and voiced.
The games aren't exactly hard, but more on the average scale. Poking around for missed items and clues will sometimes yield a special item. I don't remember if something special happens when you collect them all but you might get an attaboy. The only collectible quest I really tried on was one with Teen Girl Sqaud because you could make your own TGS comic where you kill them all. They're also voiced.
It's not really like Telltales' more recent efforts, it's closer to the Sam & Max series. That probably sums up whether you'll like this series.