You guys are weird. No but really, I felt somewhat the same way, but after episode 8 I got sucked in and marathoned the rest of the series.
It gets way better as it goes on. I was cryin' manly tears nearing the end of it. I would highly recommend watching the rest of gurren lagann if you haven't already, you will never, ever, ever, ever, ever, EVER regret it. Ever.