Preorder charts - reliable or not?

[Kenoid]

Does anyone think if preorder charts are a good indicator of how well the game will sell, or a favorite product from a well-established franchise or just overhyped?

Current List: http://news.vgchartz.com/news.php?id=6504&mp=1

Any game in this top 30 that you are rooting for?

1	Mass Effect 2	X360	2	65,108	317,181
2	God of War III	PS3	N/A	12,566	311,285
3	MAG: Massive Action Game	PS3	2	8,315	219,781
4	Battlefield: Bad Company 2	PS3	7	4,779	193,886
5	Battlefield: Bad Company 2	X360	7	8,265	127,150
6	Tom Clancy's Splinter Cell: Conviction	X360	6	7,900	109,226
7	BioShock 2	X360	4	12,431	107,897
8	Dante's Inferno	PS3	4	9,496	103,774
9	Final Fantasy XIII	PS3	8	12,065	89,851
10	Pokémon Heart Gold / Soul Silver Version	DS	9	6,680	73,612
11	Dante's Inferno	X360	4	5,908	51,596
12	BioShock 2	PS3	4	4,632	44,418
13	Gran Turismo 5	PS3	N/A	3,695	43,984
14	Final Fantasy XIII	X360	8	5,277	43,702
15	Super Mario Galaxy 2	Wii	N/A	2,186	36,062
16	Heavy Rain	PS3	6	5,598	35,533
17	Alpha Protocol	X360	N/A	658	35,354
18	Aliens vs. Predator	X360	5	5,577	30,231
19	Tatsunoko vs. Capcom: Cross Generation of Heroes	Wii	N/A	2,814	29,326
20	White Knight Chronicles: International Edition	PS3	3	3,014	27,030
21	Lost Planet 2	X360	N/A	1,073	24,273
22	Halo: Reach	X360	N/A	2,060	21,118
23	Alpha Protocol	PS3	N/A	335	20,623
24	Red Dead Redemption	X360	15	1,760	19,779
25	Aliens vs. Predator	PS3	5	3,226	18,850
26	SOCOM: U.S. Navy SEALs Fireteam Bravo 3	PSP	5	1,967	18,017
27	ModNation Racers	PS3	N/A	1,813	17,471
28	Red Dead Redemption	PS3	15	1,124	16,604
29	Lunar: Silver Star Harmony	PSP	3	2,537	15,336
30	Silent Hill: Shattered Memories	PSP	1	992	14,627