Just searched on Google and there isn't one of these lists anywhere. 
Well, lets make one! Post the crappiest ports you had the misfortune of playing and give your reasoning, and hopefully we can all agree on a top 10 at some point. I'll start.
Dead Rising 2: Off The Record (awful performance) - the worst port I've ever played, on my current specs it stuttered at an unplayable rate, would freeze and run at a very low framerate, that was at 1360x768 resolution, vsync off, anti aliasing disabled, anisotropic filtering disabled, depth effects off, shadows off, zombie quality low. It actually ran a little better using a 6850, but was still very difficult to bother with.
The Elder Scrolls V: Skyrim (laziness) - when you design a huge open world, and put nothing in it for the sake of the consoles, and then do not bother to give the cities and landscape some life when porting to the consoles bigger stronger brother, you know you're lazy. There is no reason for there being 1.5 houses and 3 citizens in each city, its appalling, give them some life for gods sake! Performance wise it's alright for a port, still stutters on hardware that is miles above the consoles but it's playable.
Lord of the Rings: War of the North (awful performance) - similar to Dead Rising, the game just flat out performs like arse.
Top 10 (so far)
1. Grand Theft Auto IV (10)
2. Dark Souls (9)
3. Splinter Cell: Double Agent (6)
4. Saints Row 2 (4)
5. Halo (3)
6. Darksiders (3)
7. Crysis 2 (3)
8. Final Fantasy VII (3)
9. Resident Evil 4 (2)
10. Darksiders 2 (2)
Game - votes

Well, lets make one! Post the crappiest ports you had the misfortune of playing and give your reasoning, and hopefully we can all agree on a top 10 at some point. I'll start.
Dead Rising 2: Off The Record (awful performance) - the worst port I've ever played, on my current specs it stuttered at an unplayable rate, would freeze and run at a very low framerate, that was at 1360x768 resolution, vsync off, anti aliasing disabled, anisotropic filtering disabled, depth effects off, shadows off, zombie quality low. It actually ran a little better using a 6850, but was still very difficult to bother with.

The Elder Scrolls V: Skyrim (laziness) - when you design a huge open world, and put nothing in it for the sake of the consoles, and then do not bother to give the cities and landscape some life when porting to the consoles bigger stronger brother, you know you're lazy. There is no reason for there being 1.5 houses and 3 citizens in each city, its appalling, give them some life for gods sake! Performance wise it's alright for a port, still stutters on hardware that is miles above the consoles but it's playable.
Lord of the Rings: War of the North (awful performance) - similar to Dead Rising, the game just flat out performs like arse.
Top 10 (so far)
1. Grand Theft Auto IV (10)
2. Dark Souls (9)
3. Splinter Cell: Double Agent (6)
4. Saints Row 2 (4)
5. Halo (3)
6. Darksiders (3)
7. Crysis 2 (3)
8. Final Fantasy VII (3)
9. Resident Evil 4 (2)
10. Darksiders 2 (2)
Game - votes
Dead Rising 2 OTR - 1
Skyrim - 1
LotR: WotN - 1
Darksiders - 3
Darksiders 2 - 2
Nation Red - 1
Resident Evil 4 - 2
Oblivion - 1
Assassin's Creed DC - 2
Dark Souls - 9
Grand Theft Auto IV - 10
Call of Duty MW2 - 1
Call of Duty MW3 - 2
Star Trek: Legacy - 1
Saints Row 2 - 4
Splinter Cell: Double Agent - 6
Starcraft64 - 1
Need for Speed: The Run - 2
Crysis 2 - 3
Transformers WfC - 1
Star Wars TFU - 2
FF VII - 3
FF VIII - 1
Halo - 3
Turok - 1
Kane & Lynch 2: Dog Days - 1
Prototype 2 - 1
Star Wars TFU 2 - 1
Soldier of Fortune Payback - 1
Far Cry 3 - 1
Mercenaries 2: World in Flames - 1
Skyrim - 1
LotR: WotN - 1
Darksiders - 3
Darksiders 2 - 2
Nation Red - 1
Resident Evil 4 - 2
Oblivion - 1
Assassin's Creed DC - 2
Dark Souls - 9

Grand Theft Auto IV - 10
Call of Duty MW2 - 1
Call of Duty MW3 - 2
Star Trek: Legacy - 1
Saints Row 2 - 4
Splinter Cell: Double Agent - 6
Starcraft64 - 1
Need for Speed: The Run - 2
Crysis 2 - 3
Transformers WfC - 1
Star Wars TFU - 2
FF VII - 3
FF VIII - 1
Halo - 3
Turok - 1
Kane & Lynch 2: Dog Days - 1
Prototype 2 - 1
Star Wars TFU 2 - 1
Soldier of Fortune Payback - 1
Far Cry 3 - 1
Mercenaries 2: World in Flames - 1
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