Total Mayhem takes Total Annihilation, bugfixes and extends it the way Cavedog might have. Early game pace is quicker, many new units added (longtime players may recognise some 3rd-party units), including a whole new 3rd tech level tier. Existing and added units have been bugfixed, rebalanced, re-modeled, re-textured and re-rendered to equal or exceed the standard of the original TA units.
Textures on the terrain need to be improved. Also more 2-D graphic workers like you guys need to mod StarCraft... This is great. =)
Texture of the terrain depends on the map,there are good textured maps and there are excellent textured maps. Starcraft is too hard to mod compared to modding TA which is far more simpler and easier,spawning some good mods like Mayhem. Note that TA units uses actual 3d object models,not graphical sprites as used in Starcraft. So there is a clear difference of what needed to be done between modding TA and Starcraft.