Most of the mapping tools I have worked with, if you want more in depth features, it will have a harder learning curve. It also depends on what game you are designing levels for. Neverwinter Nights is completely different than Wolfenstein: Enemy Territory (RTCW:ET), so the tools for the respective packages will be just as diverse. I personally like GtkRadiant for RTCW:ET.
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The real question is how fast do they drive their cars in GTA.
Most of the mapping tools I have worked with, if you want more in depth features, it will have a harder learning curve. It also depends on what game you are designing levels for. Neverwinter Nights is completely different than Wolfenstein: Enemy Territory (RTCW:ET), so the tools for the respective packages will be just as diverse. I personally like GtkRadiant for RTCW:ET.