Let's see, reasons why people love Season 2 less than the others:
1/3rd Ziggy being annoying
1/3rd too many white people, not enough corner shit, not enough Barksdales, the focus on a union and not strictly on the street is kind of a shock if you're not anticipating it.
1/3rd the show never really coming back to the stevedores as major characters (the way it keeps giving, say, Bunny, Cutty, Michael and Dukie lots of shit to do even after "their" season ends).
Personally I don't have a problem with any of that and think it's probably the third best season (43251, if you're wondering) but when people say it that's what they're referring to.
Fun fact: BET reran The Wire but cut out basically every scene involving the Sobotkas and/or the Greeks. Because they're awesome like that.
Way to shitty it up BET. I go with 2 last but it is a very close last. I need to do my annual rewatch sometime soon but I'd go 41532 with 4 as the only definite position. I have a feeling if I rewatch 3 again especially it may rise back up again. In any case Ziggy is made up for by the introduction of Frank Sobatka who was great. Trouble was them killing him off
kind of spoiled the ability to really reincorporate many of the characters.