You've got to stick with it for a while. Trust me, I went through the same thing. Then finally, it just clicked and now I love Ultraseven
*Edit.
Also, what you're experiencing now is normal of most old school tokusatsu shows. Even the best ones, you kind of have to grind through certain portions once they become formulaic and stale, but there's almost always a reason to stick it out.
Just try and make watching the show a part of your routine. Right now, I'm going through my second complete run through of Kamen Rider V3. I watch it every morning with my cup of joe. Heck, even though I like the show, once it gets into the 20s it's kind of the same thing over and over again until Riderman shows up in the 40s, but once he does, it's the stuff of legends.
You just can't wait until you FEEL like watching the show though otherwise you'll never finish it. Sometimes, you just have to power through.
Odd, how watching something you love can also seem like so much work lol.