As a collector, few things bug me (in terms of presentation) as much as unpainted weapons. You can have an awesome sculpt with decent jointing and passable paint, but the second you pop something like a bright orange weapon (that shouldn't be orange) in his hand it's just going to look silly.
Donatello's weapon set (header) looks phenomenal with a few shades of paint. His weapons went from gaudy red plastic to something resembling actual wood with excellently shaded bandage-grips. Mike's bright orange weapons underwent a similar upgrade, going from "what the heck?" to "heck yeah!" The apps are arguably less essential on Ralph's and Leo's weapons but even merely coloring in the grips goes a long way.
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