My own opinions that I have formulated in the last 1196 days of CN. Alliances rated at 5 are ones that I do know/or have no opinion.
TOP - 10 - My home
MHA - 8 - Good people, sound government
Sparta - 5
NpO - 7 - huge respect for the incredible turnaround since the war of the coalition.
IRON - 9 - see MHA
ODN - 6 - fun, nice general membership.
FARK - 7 - quality government, know little about their general membership
GPA - 3 - Just don't understand the point of neutrals.
NPO - 6 - Great history, and play their role well.
FOK - 8 - see MHA/IRON
MK - 4 - we play the game differently
WTF - 5
TOOL - 5
TDO - 3 - see GPA
VE - 4 - Just not the same VE I remember from the WUT days.
Legion - 6 - Good memories from my time in GATO and coming to our aid in GWIII.
RoK - 4 - Would have been a 5, but after Gen Lee going rogue it left a sour taste unfortunately.
GATO - 8 - My first home, great memories from the three great wars.
CSN - 5
Athens - 3 - Particular members who bring a bad impression to the rest of the alliance.
Gremlins - 8 - Great guys, who have lost some of my favourite members.
MCXA - 3 - not that positive after the TSO affair and reading the logs.
UPN - 6 - respect after fighting their members in the karma war
RIA - 6 - I respect their leadership from the debates I have read.
STA - 4 - Not sure why, just always seen them in the shadow of Polar.
Invicta - 5
RnR - 7 - great government, good membership
MASH - 5
NADC - 5
WAPA - 7 - great people who don't mind risking their pixels.
NV - 4 - Don't know them well, but I have a more negative opinion for some reason.
NSO - 6 - Came to change things, haven't succeeded imo but props for having balls.
NEW - 5
MA - 2 - Astronaut Jones
Umbrella - 9 - Great government, great general membership. Active, intelligent, and fun.
FAN - 7 - You have to admire FAN for still being around.
LoSS - 5
TSO - 8 - Great allies
NATO - 5
Nordreich - 4 - been there, done that. Denmark belongs to TOP!
GR - 5
Vanguard - 2 - meh
GOD - 4 - Less than positive view after Karma.
FoB - 5
PC - 5
Valhalla - 4 - distant memories of nowedge *shudders*
GGA - 2 - ...words needed?
TPF - 5
:edit: average is 6.476