Lots of fun, great storylines, Awesome new weapons/vehicles and characters.
What i really liked about these games are the great storylines, which as an RPG'er, is important to me, and also the new weapons which made the game, as i doubt without them the game would have been as fun to play. I especially liked the exploding bullet gun in BoGT, it completely wrecks anything it hits, like cars and helicopters.
I also loved the automatic machine gun which played like a mini-gun in that it doesn't seem to need a reload. The sticky bombs were also a lot of fun, and very useful during repeat mission where you could plant the fight scene with sticky bombs beforehand, and blow them all up during the fight.
The new helicopter with rockets and a machine gun was a much welcomed addition, especially becomes its far easier to fly because its smaller than the helicopter with a machine gun in the original, making it possible to get inbetween buildings and down to a really low level as your firing of your rockets.
The tank was also a nice addition but i wish it was a bit more resistant to gun fire because once you really have fun with the tank and reach 5 stars, all the gun firing at you is too much for the tank to handle for very wrong. I also disliked the camera view of the tank when firing, because the game won't allow you to move your camera to see behind you very fast, the camera tries to resist.
I like the new bike handling in L&D and i love that in both games i can call friends to bring me cars/bikes which is very useful before missions/races.
One major improvement to the game is to the normal people around you, on the streets. In my experience, in the original, all misc. people were nice, unarmed and would only fight you with hand to hand combat, but to my surprise, this time i bumped into a person and he pulled out a gun and started shooting me, also i see the police having gun fights more often in the streets randomly.
I hope if they bring out another instalment, we get to buy/sell businesses like in GTA Vice City, that still remains one of my favourite games, buying business and houses with different bonuses and styles.