Yeah...the series was really hampered by that set up. It's too hard to maintain in the long run. The good news is (sorta spoiler)
I had similar feelings when I first watched Enterprise a couple years ago. There were good one off episodes, but there was a lot of bland in the middle. I also didn't care for the Xindi arc until late in the season. For me, a few episodes into Season 4 the series suddenly stepped up in interest and quality. Not perfect, but like the show figured out what it wanted to do.
I recently finished a 'good parts' rewatch of the series, and found I liked it fairly well.
Don't know how much of this thread you've read, but think about skipping the series finale.