Many of the newer games are very aggressive with LOD because they blur the hell out of the distant objects with DOF. It was much better when fog was used for this purpose. Some designers and engines are better with hiding LOD transitions than others, it comes down to whether they care about what the game looks like in action verses screen-shots to sell the game. Of course, having more play-field opens up some nice game-play possibilities so sometimes these artifacts are just a deal with the devil to make certain game styles possible. (Certain game genres, like forest dwelling RPG's, MMO's (Oblivian) absolutely depend on LOD ).