Terran, to me, seems a bit harder to manage than the other two races. You need to heal your units with an SCV or Medic (as opposed to the Protoss/Zerg who regenerate shields/health automatically), your cloaking is temporary (Wraiths and Ghosts need energy to cloak while Zerg ground units can stay burrowed indefinitely and Protoss cloaked units never lose their cloaking).
Building is more convoluted than that of the Protoss/Zerg. To build, a Terran player needs to send an SCV to build something, and the SCV is occupied until the building is complete. Unless you're very good at multitasking, when you need to build several buildings at a time, you'll end up with several SCV's sitting around doing nothing for a while (assuming something else occupies you, such as an enemy attack).
When the Protoss build something, they send out a probe to build a rift. Once the rift is opened (takes less than a second), it'll make the building on its own and the Probe is free during this time, meaning a single Probe can effectively be used to quickly make a defensive matrix of turrets without the help of other Probes. When the Zerg build something, the Drone mutates into the building, meaning you lose a Drone, but you don't have to worry about having an idle Drone once the building is complete.
I think the Terrans are the best team when it comes to reconnaissance, however. The ComSat station can occasionally be used to reveal any area on the map, where as the other two races would need to send units to scout the area. Very difficult to do against a heavily defended base.
The Protoss are a close second, however, with their Observers (flying permanently cloaked units that can detect enemy cloaked units). Dark Templars are also excellent for guarding resource areas and preventing enemies from building there. One of my favourite strategies in Starcraft is to keep a close watch over all the resource points, and prevent the enemy from building there, leaving him screwed when the resources of his main base run out.
The Protoss always seemed to be the simplest to manage to me. Perma-cloaked units, automatic shield regeneration, single Probe building, and fewer (but stronger) units made it easier for beginners to manage them, especially seeing as how in Starcraft 1, you could only control 12 units at a time (something that will be thankfully fixed in Starcraft 2)