After re-thinking 2H weapon for Paladin, I made a list. As I ran out of tecnical mojo for today, it's only given like this and not in a nice table.
From level 2 to 70 all vendor items are better.Name Requored level DPS
Two-Handed Sword - - - 2 - - - 4.4
Large Axe - - - 3 - - - 4.9
Wooden Mallet - - - 4 - - - 5.4
Tabar - - - 9 - - - 8.5
Claymore - - - 10 - - - 9.0
Giant Mace - - - 10 - - - 9.0
Bearded Axe - - - 15 - - - 11.9
Espadon - - - 16 - - - 12.5
Rock Hammer - - - 16 - - - 12.5
Battle Axe - - - 20 - - - 15.3
Dacian Falx - - - 21 - - - 16.0
Maul - - - 21 - - - 16.0
War Hammer - - - 30 - - - 22.4
Bullova - - - 30 - - - 22.4
Flamberge - - - 31 - - - 23.1
Great Axe - - - 39 - - - 31.4
War Maul - - - 40 - - - 32.6
Zweihander - - - 41 - - - 33.7
Draenic Warblade - - - 60 - - - 54.0
Mag'hari Battleaxe - - - 60 - - - 52.2
Forsaken Greatsword - - - 70 - - - 56.1
Dalaran Great Axe - - - 70 - - - 59.7
Dalaran Greatsword - - - 70 - - - 59.7
Dalaran Hammer - - - 70 - - - 59.7
Brunnhildar Great Axe - - - 75 - - - 63.4
The next 8 items are only included to complete the list Battlefront Sword - - - 78 - - - 61.9
Stone Trogg Crusher - - - 78 - - - 61.9
Earthen Mallet - - - 78 - - - 61.9
Stone Hearth Maul - - - 78 - - - 61.9
Stone Hearth Splitter - - - 78 - - - 61.9
Hearth Defender's Axe - - - 78 - - - 61.9
Earthen Champion's Cleaver - - - 78 - - - 61.9
Earthen Sunderer - - - 78 - - - 61.9
At level 74 drops become very interesting. Drops painted red. Dalaran XXX - - - 70 - - - 59.7
Warped Greatsword - - - 74 - - - 152.4
Abandoned Greatsword - - - 74 - - - 106.7
Shattered War Mace - - - 74 - - - 152.4
Icesmashing Mace - - - 74 - - - 106.7
Melted Cleaver - - - 74 - - - 152.4
Ice Cleaver - - - 74 - - - 106.7Brunnhildar Great Axe - - - 75 - - - 63.4
Fractured War Mace - - - 79 - - - 191.5
Salt-Scored Cleaver - - - 79 - - - 191.5
Salt-Scored Greatsword - - - 79 - - - 191.5
PS. If somebody with time and mojo make this into a nice table or two I'll promise to take no offence whatsoever.