alrighty, a simple question; what makes a good dom map?

im not looking for content/style tips, i can fiddle those myself, im more after what makes a good ddom map 'work'.

eg. ideal time from spawn to either dom point (eg ctf flag-to-flag times of around 30-45 secs, should ddom be similar/less?), number of access routes to each dom point, power/pickups available.

anyone care to offer some insight into this sort of thing?

if you do choose to reply with your thoughts, thanks, else leave me a random smiley to signify that youve been able to read the whole post up to this point