Sorry, Picard! You were the best thing in TNG.
I remember giving up on Babylon Five during the first series, but then watching it again in the third and finding it was suddenly really good! It definitely had some wonky acting though, and as Aldaris said it looks quite dated.
I love DS9, with the exception of the (not quite sure, but should be about right) first two seasons.
In the beginning it's pretty much trying to imitate TNGs schtick, with problem of the week plots that have little if any continuity, and the writers are clearly still trying to find their stride with the chraracters. After they get that down and find the courage to say "hey, we actually CAN have plots that take multiple episodes or even seasons to resolve, and that will make for better stories all round" it gets awesome.
They actually weren't allowed much continuity early on. Apparently, the writers were only allowed to introduce the Dominion 'if it was resolved after a couple of episodes.'
It took five series.
I looked at a list of episodes, and you're mostly right about series one and two being weak. But there are still some good episodes, notably: Duet, In the hands of the prophets, Cardassians, Necessary evil, Whispers, Blood oath, The wire, and The collaborator.