I ran my reference benchmark to compare against three popular blockers.

Results -- figures are 3rd party / all:

µBlock 0.1.0.4

• Domains: 66 / 67
• Hosts: 117 / 171
• Scripts: 239 / 321
• Outbound cookies: 8 / 42
• Net requests: 1,035 / 1,877

Adblock Plus 1.8.3

• Domains: 72 / 73
• Hosts: 124 / 177
• Scripts: 243 / 328
• Outbound cookies: 8 / 44
• Net requests: 1,041 / 1,913

Ghostery 5.3.0

• Domains: 83 / 84
• Hosts: 140 / 211
• Scripts: 239 / 343
• Outbound cookies: 17 / 57
• Net requests: 1,046 / 1,930

Adguard 1.0.2.9

• Domains: 89 / 90
• Hosts: 145 / 217
• Scripts: 262 / 349
• Outbound cookies: 18 / 68
• Net requests: 1,064 / 1,904

Disconnect 5.18.14

• Domains: 95 / 96
• Hosts: 163 / 239
• Scripts: 283 / 381
• Outbound cookies: 18 / 74
• Net requests: 1,087 / 1,989

No blocker

• Domains: 380 / 381
• Hosts: 566 / 644
• Scripts: 490 / 592
• Outbound cookies: 245 / 315
• Net requests: 1,950 / 2,871

The figures show the number of requests allowed, thus lower numbers are better. The point is to show how many 3rd-party servers are hit on average after running the reference benchmark (three repeats in the current instance).

The less hits on 3rd-party servers, the better. All blockers where configured in such a way as to compare apples-vs-apples.

Since Disconnect doesn't support blocking social widgets, these were not blocked for other blockers (so Fanboy not selected for µBlock/ABP, and social widget blocking not selected for Ghostery/Adguard).

So I would say µBlock does pretty well block-wise. It's less sexy etc.. (keep in mind it's v0.1), but then it's also completely devoid of any agenda -- aside that as a developer it's nice to see my stuff used.

Edit: Adding benchmark details so that other people can reproduce. All blockers were configured in such a way as to compare apples-vs-apples:

• µBlock: out-of-the-box settings -- no change.
• Adblock Plus: EasyList, EasyPrivacy, Malware Domains checked. Acceptable ads unchecked.
• Ghostery: Advertising, Analytics, Beacons, Privacy checked. Widgets not checked. GhostRank unchecked.
• Adguard: English, Spyware and tracking, Phishing and malware protection checked. Social media not checked. Acceptable ads unchecked.
• Disconnect: out-of-the-box settings -- no change.