Introduction
Brilliant!
Nice!
Quite good, actually
Interesting
Oh dear...
Below are the serials that I've reviewed, shown in descending order of appreciation (and in chronological order per category).
The ones that I love, warts and all.

Complete serials:
The Daleks (1963 - 1964)
The mind robber (1968)
Spearhead from space (1970)
Pyramids of Mars (1975)
City of death (1979)
The caves of Androzani (1984)
Revelation of the Daleks (1985)
Ghost light (1989)
New Doctor Who:
The unquiet dead (2005)
Dalek (2005)
Father's day (2005)
The empty child / The Doctor dances (2005)
Excellent stuff that I just don't quite love.

Complete serials:
An unearthly child (1963)
The invasion (1968)
The seeds of death (1969)
Inferno (1970)
The green death (1973)
Genesis of the Daleks (1975)
The robots of death (1977)
Castrovalva (1982)
Earthshock (1982)
Vengeance on Varos (1985)
The curse of Fenric (1989)
The TV movie (1996)
Incomplete serials:
The evil of the Daleks (1967)
The abominable snowmen (1967)
New Doctor Who:
Rose (2005)
The end of the world (2005)
Boom town (2005)
Bad wolf / The parting of the ways (2005)
These are a mixed bag. Some of these serials, like 'Carnival of monsters' or 'The ark in space', are based on excellent stories, it's just that the way they're visualised is flawed or simply hasn't aged well. In other cases a less-than-great story is to a certain extent compensated by interesting design ('The claws of Axos') or nice pacing and good location work ('Remembrance of the Daleks'). If you're willing to look beyond these serials' flaws, there's still much to enjoy here.

Complete serials:
The Aztecs (1964)
The Dalek invasion of earth (1964)
The claws of Axos (1971)
Carnival of monsters (1973)
The ark in space (1975)
The Sontaran experiment (1975)
The hand of fear (1976)
Horror of Fang Rock (1977)
The leisure hive (1980)
Logopolis (1981)
The visitation (1982)
The resurrection of the Daleks (1984)
The two Doctors (1985)
Remembrance of the Daleks (1988)
Incomplete serials:
The crusade (1965)
The underwater menace (1967)
The moonbase (1967)
The web of fear (1968)
New Doctor Who:
Aliens of London / World war III (2005)
The long game (2005)
Weaker stories with some redeeming qualities, or average-to-good stories that haven't aged well. If you're not a fan of Doctor Who or of science fiction in general, you may want to give these a miss.

Complete serials:
The edge of destruction (1964)
The tomb of the Cybermen (1967)
The talons of Weng-Chiang (1977)
The keeper of Traken (1981)
The five Doctors (1983)
The mark of the Rani (1985)
Incomplete serials and reconstructions:
Marco Polo (1964)
The Daleks' master plan (1965 - 1966)
The celestial toymaker (1966)
The faceless ones (1967)
The enemy of the world (1967 - 1968)
The wheel in space (1968)
The space pirates (1969)
The ugly ducklings.

Complete serials:
The web planet (1965)
The three Doctors (1972 - 1973)
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