Door hinges are not all the same. Some old homes have hinges that are ornate, and have square corners. Many modern door hinges are unattractive. You can replace modern ugly door hinges with gorgeous hinges that are solid brass, look old and have decorative tips.
Door weatherstripping can stick to freshly painted doors. This can happen even if you let the paint dry overnight and it feels dry. Paint that feels dry and paint that is fully cured and hard are two different things.
A door can fit poorly if the wall in which the door is hung is twisted. Doors are usually flat and the wall surface must also be flat for the door to meet evenly all along the edge of the jamb when the door is closed.
Fiberglass doors are made by two major manufacturers: Therma-Tru and Stanley. Their exterior fiberglass doors are made with quality. Therma-Tru even has its own line of stain for their fiberglass doors.
Mirrored doors, like any door, can be difficult to install. The door opening should be plumb, door tracks need to be cut and the instructions should be followed carefully. Mirrored doors have different sizes and parts and can be framed or frameless.
Mirrored doors are not as expensive or hard to install as you think. Mirrored closet doors have always been popular, but they don't just have to be in bedrooms. Stanley mirrored closet doors have wood trim or you can get decorative glass inlays. Here is a list of mirrored door manufacturers.
Stained glass shops have a variety of materials to start you on a custom decorative glass door. Stained glass doors and stained glass windows are very attractive and can be custom ordered. Here is a list of stained glass manufacturers.