(These are all purely my opinions, so if you disagree you don't need to get too offended. :tongue.gif:)
1. Birch trees. They're ok-ish, but they just seem really out of place in the Minecraft world. The bark is badly textured, and it really doesn't looks good next to any other block in the game. I really haven't seen anybody make anything good-looking out of it without a texture pack. Bleck.
2. Tall Grass. The original tall grass mod was great. Small, subtle, looked wonderful. Notch's version of this mod? Tall, ugly, non-centered, laggy, and looks like my uncle's hairy, unshaven.... well, you get the point. This is my least favorite update to Minecraft.
3. Glitchy biomes. Unrealistic biomes are a pain. It definitely ruins the sense of "infinite maps" in Minecraft. Instead of one huge world, it seems more like somebody took 4 worlds, shoved them in a blender, asked their toddler to re-arrange the pieces, and called it a day.
Those are basically the 3 main points against the current terrain generation that I have. I know Notch and Jens are working hard on the new generation for 1.8, and they're awesome for that. Terrain is just what's been keeping me from un-installing my 1.1.0 backup and giving 1.7 another chance.
Of course nothing can come close to the original Alpha world generation, that was just purely epic. Biomes were just an absolute huge leap down in terms of terrain.
Agree? Disagree? Have no idea what I'm talking about because you joined in Beta?
Don't understand your complaint with birch trees, they look pretty much the same in real life. And you seem strangely angry about tall grass.
Well, map generation in 1.8 fixes all of your biome complaints, and seems to have more dramatic features with the mountain biome, so you can feel good about that. Remember, you're playing a beta.