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A lot of uplay games still aren't playable (I am still upset over HoMM6 :P), and uplay support manages to be worse than steam's.
Note that the issues vary game to game, person to person, so even if you've had good experiences so far, that doesn't mean Uplay isn't a bit of a mess, run by a company that gives even less a shit about quality and their customers than Valve. :X

Origin actually has great support and solid quality, it's their marketing and breadth of service that need work (EA has never really been the most creative or adaptive company, but they do tend to offer reliable service. I hear rumors that they've started reorganizing in that regard, so perhaps we'll see more of note from them in the future.)
Most people hating on origin for anything other than their limited selection and higher prices (the same issues GOG has, though GOG offers higher quality products in general to make up for it), tend to just be Steam fanboys/girls. :/
(Or people upset over the one password leak origin had, that, as far as I've heard, EA dealt with quite well. You don't hear people complaining near as much over Valve's recent leak, by comparison, despite their terrible handling of it. :P)