Is How I met Your Mother getting better or worse?

I used to love the show How I met Your Mother. It was a funny and fresh sitcom. However now it seems to be getting boring and dull. For example the first two seasons (especially season 1) were really good. They were solid, funny and new. However Season three and four were just boring during most of their seasons. The ending of season three of How I Met Your Mother was good-- I liked where it was going-- however it got worse when it entered into season four. I'll comment some more in the future-- but does anyone else agree with me here?