what do you like about classic who?

I’ve been a fan of new who for as long as I can remember. I only watched little bits of the classic series here and there whenever my dad was watching it. I am now wanting to watch through classic who because I feel like I’m missing out.

However, I’ve tried to watch it a couple of times but only made it through several episodes before getting bored (apologies). So I want to know, what do you like about classic who? What makes you keep watching? What am I missing out on, and what do I have to look forward to?