There are many good gambits, from tactical ones such as the Fried Liver Attack, the Evans Gambit, or the King's Gambit, to positional ones such as the Volga Gambit. But there are many bad gambits, such as The Omega Gambit(1.d4 Nf6 2.e4?) or gambits with one trap in mind, and nothing else (Blackburne-Shilling Gambit). Are there more of such gambits?
latvian, halloween, wing, englund, elephant, freds, colorado, danish gambit, tennison, and budapest gambit of the top of my head. These gambits are unsound and a proper response will have the gambiter in a worse position.
Some gambits I do like are kings gambit, smith morra, evans, queens, scotch, benko, lisitsin, staunton, fried liver(Na5), froms.
I just want to save 2 gambits from being classified as "bad", the fried liver and the king's. 3 cooks fried an GM with the fried liver, the fried liver is +1.67, and the king's gambit's only "refutation" is the keene's defense, weakening the kingside (1.e4 e5 2.f4 Qh4+).
You could say the froms is good, but in fact, if white plays accurately, black would lose fast, analysis says the froms is +0.81. I accidently triped over an analysis of the omega gambit and it appears to be -0.66, while the kings is -0.79, so, you see, reputations isn't everything. There's another one, on my analysis board, the halloween is -0.59, see? The smith morra is not a great gambit with -0.21.
I just cannot understand the blackmar-diemer gambit, cause when theres an option to gambit a wing pawn, why gambit the center pawn? The 1.d4 d5 2.e4 is -0.97, and the 1.d4 d5 2.Nc3 Nf6 3.d4 is -0.72.
The old benoni is +0.88 if you don't accept the pawn, and the modern is +0.96 if you don't accept the sac. Apperantly the benko gambit is one of the most inaccurate gambit, it says +1.20, although it is good for human play. The Duras is +1.90 if black used it, so it's useless, the most inaccurate one is the traxler counterattack, which is +2.57 if black used it.