I wasn't alone though. This isn't hindsight. MANY a TV writer/critic hated the finale back then too:
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Originally Written by Andy Greenwald of Grantland
Pitt’s Jimmy Darmody came the closest to resonating, a tarnished golden boy and WWI veteran who had no trouble breaking bad because he was already so deeply broken. Through Jimmy,
Boardwalk indulged its basest — and thus most successful — instincts. In the run-up to the second season finale, Winter practically gave himself the vapors pushing Jimmy to the edge: discovering the murdered corpse of his wife before flashing back to his incestuous history with his showgirl mother; having him betray Nucky, his surrogate father, while stabbing his real one (the great Dabney Coleman) through the heart. Like
frozen custard on a hot day in Seaside Heights, the texture may have seemed artificial, but at least it tasted good. Yet at season’s end,
Boardwalk Empire’s most compelling character was sacrificed not as inevitable karmic retribution or to tie a ribbon on a finished story line, but to accomplish the sort of hard work that should have been done in the writers’ room months before: making Nucky Thompson, the putative protagonist, worthy of our attention. It was shocking, but felt cheap; a flawed series trying to save face by putting a bullet in Jimmy’s.