There are not many airports that I dread since flying and plane spotting are favorite hobbies. For small airports, MHT, PVD, GSP, and LGB are hard to beat. For mid-size airports, I especially like TPA, PDX and IND. For large Hub airports, Sea-Tac, Ohare, and DFW would be my choices. I included DFW just to defend my hometown airport since everyone else is bashing it. It might be bad to change planes at, but there is no other large airport which is easier and faster to use if you live at. From drop-off to ticket counter to plane is just a few feet! I do agree with DTW being the worst. There is nothing that comes close to it. My honorable mention choice for least favorite airport is the new Denver International. Not that it's that bad, but with all of the money spent and all of that land available, they ended up with an airport that is completely bland and lackluster.