Yes, it absolutely gets better!! It only really starts to get going about midway through the second season. The 3rd season is the best of all, lots of stuff comes together and pays off. The 4th season is great too, although it sags a bit in the middle.
The 5th season you can skip altogether, except for the final episode. The reason is because they thought there wouldn't be a 5th season, so most of the major plot lines are tied up at the end of the 4th. But the final episode is quite touching, and you don't need to have seen the 5th season to understand it.
Feel free to ask me more about it if you want.