I would agree right up the the N95. Although it eventually turned out to be a reliable phone, the initial few issues of firmware were buggy as hell, and the GPS was best not even used unless you had 5 minutes to stand still for it to lock.
That should have been a warning that things were heading the wrong way... But it took me to buy an N97 to realise Nokia had been caught with their pants down, raped and left traumatised and shaking when they should have been designing (and supporting) new phones. A phone that was released at least 12 months before it was ready, and abandoned before I'd got halfway through the 24 month contract I'd stupidly signed into. Prompting me to outright buy a replacement phone, just so I didn't need to use the N97 any more. The N97 ended its days with a Hegazy firmware on it, which is a little better, but it still suffers from serious hardware issues - GPS again for starters. It's now used simless as my MP3 player, thanks to its 32gig of storage MicroSD and Nokia headphones with the built in remote buttons.
Symbian was/is a fine mobile OS. Very lightweight and seriously battery friendly. It could have been a contender, but not when it was managed and owned by a company that had all the manoeuvrability of an oil tanker.