What I find with PSN is that a lot of games, big titles too (Call of Duty 4 and 5 for example) have some horrendous bugs that ruin online play - such as the (now patched) CoD5 Castle level where you could get under the play area and kill but not be killed.
If Sony pays the bills with content providers and not from its customers subscriptions then there isn't the direct incentive to put pressure on developers to fix games quickly that there would be if the customer base withdrew funding.
They also seem to care less about there customers online experience - PSN really needs the ability to kick some players - I'm all for freedom of speech but I'm sure it doesn't include the right to whistle in your headset or sit right in front of the TV creating the feedback loop from hell. I'd pay for that.