Its not shot to . Professional players use it all the time to prevent cheese tactics. You just can't bunker yourself in and hope to survive a game with anyone that knows how to play half way decent. Then again, you couldn't do that in SC1 either. You'd get out-macroed in no time.
Some of my favorite changes are: high yields. Terran mules (so effective in getting you back on your feet or just giving you that immediate boost). Zergling speed got augmented to insane proportions, so much so that zerglings now are incredibly useful provided you know how to micro them properly. Zerg roaches were ing incredible before the latest patch nerfed them, they're still good but now cost 2 instead of 1. s with everyone's roach build. There are a lot more, just don't feel like keep going.
In short, they've done an incredible job in changing just enough to make it fresh without ing up the incredible mixture of elements that made the first Starcraft a revolutionary leap in RTS gaming.