I really like the early intros for their use of video effects of the time, and the anthem is one of the few bits of music employing a theremin, which really endears it to me. But yeah, as it gets to the 80s, they get progressively cheesier.
As for the various plots, they range from pretty cool sci fi, to some over the top monster of the week plots, but the progression of plots involving the daleks are often quite inspired in both directions: the absurdity of a monster that isn't much more than a cardboard box and a plunger that has no indoor voice, and the intricate back and forth between the doctor and them as age old adversaries.
And the use of the tardis/time travel as allowing the writers to set the story anywhere and anywhen, but not useful or reliable to be used to solve the immediate problem of the plot line.
Heck, the third doctor being exiled to Earth and becoming a consultant for UNIT is an excellent set up.
Anyway, yeah. It is a lot, but it was worth it.