Apart from my uni years in Manchester & a stint in Mile End, I'm a Gravesend girl born & bred!! Currently living in the Northfleet bit of Gravesend.
As you don't say where you're from, its difficult to say what its like to live in, because its relative, & you don't say which part you're looking to move to. Some areas are pretty poor, others are lovely, it all depends. It's less friendly than 'oop north' but I don't feel worried I'll get stabbed by the nearest person.
The buses & trains are good & as a location for travel, its a good place to get away from; Dover isn't far, nor is the M25. And now with Ebsfleet, central London is wonderfully close/quick.
None of the shops are particularly fancy, but I think the town centre suffers from proximity to Bluewater in this economic climate. M&S is still there, along with BHS, Boots, Superdrug etc. but there are also lots of pound shops and so on.
I've made lots of local lovely Mum friends since having my DD & can't say I ever knew my neighbours in Manchester or London, but do now. Again, like anywhere though, its all relative & it depends what you're after.
I walk around the area a lot pushing my buggy & love the fact that there are lots of parks & leisure centres all around, so there's always something to do.
Oh and if you have a girl, Northfleet School for Girls is pretty good if grammar isn't an option.
Hth