I'd say MW2 is a great expansion pack for CoD 4: Modern Warfare, a new game mode, improved multiplayer and a long campaign as well. The only thing wrong with it was its price.
I miss the old school expansion packs, Warcraft 3 The Frozen Throne is the best example I can think of, but then again I didn't plat much back then. However I think it's ineffective to think that we can ever truly go back to that. I much prefer smaller, cheaper DLC to the big expansions, but they have to still have the same quality as an expansion, and that's extremely rare. Bethesda does it best. And while I haven't played it, I hear Read Dead Redemption's expansion was great.
Also, why is it so rare with campaign DLC???
I miss the old school expansion packs, Warcraft 3 The Frozen Throne is the best example I can think of, but then again I didn't plat much back then. However I think it's ineffective to think that we can ever truly go back to that. I much prefer smaller, cheaper DLC to the big expansions, but they have to still have the same quality as an expansion, and that's extremely rare. Bethesda does it best. And while I haven't played it, I hear Read Dead Redemption's expansion was great.
Also, why is it so rare with campaign DLC???