They vary, but most are often packed out.
Many are noisy as a result, but one can find quiet times at one's local.
For a chain, they ain't bad. Depends on what one is looking for.
//Sticky floors, disgusting cheap food, rowdy clientele, zero atmosphere //
Well, diddly, in order to make that assessment you've either visited many branches - which would suggest your first, second, third, etc., experiences couldn't have been so bad - or you've misread the sign outside and have gone to a greasy spoon by mistake.
I've been in a few when e.g.in god-forsaken places and they've been the only place open on Sunday lunchtime or I've been invited by colleagues to join them for a drink after a meeting and a Spoons is the nearest pub.