I liked the thirteenth season a lot, especially the first half. 'Margaritaville' and 'The Ring' get better each time I watch them: they certainly have the feel of old school eps.
Not massively so, to be honest. I sorta wish they'd stop doing 'OMG we're so recent look at how quick we can talk about this issue' episodes and just do school-based ones: the issue episodes have tended, in recent years, to be very hit-and-miss, in my opinion. I'm still watching, but I have less love for these new episodes than for ol' classics.