You are in for a treat. Much as I love season one, the second season is where it really starts to go off the hook. Great new characters you wonder how you made it through the first season without, and a plot that's a lot more cohesive and a little bit darker. Enjoy!

They are still in the middle of broadcasting season three, yes — in fact they've just taken a several-month hiatus in the middle of the season, and no indication when it will start airing again. >:( But the third is the last season of the original show — though Mike and Bryan say they will do other things in this universe. And of course there are the live action movies to look forward to.