Can't help with the quality question but I stopped pc gaming around 3-4 years ago and now use my sons XBOX Live . Mainly on the cost of what seemed like constant upgrades to keep the latest games running at decent frame rates. I actually can believe someone buying a PS3 to play Black Ops IF the pc it was being attempted on was older kit the gameplay may not have been great. Don't know what requirements are needed though.
A PS3 bundle with Black Ops can be had for circa £260. A graphic card upgrade + more memory+processor+etc. =????
Online gaming was always the big thing for me on the PC, going back to modem-to-modem original Doom. Its something the consoles have been doing very well for awhile now (so easy with xbox live as well) so has overtaken the pc for it for me.
For me now its xbox = gaming (my gamertag is DarthDay)
netbook = cyclechat

/ email
desktop = kids schoolwork (though can't see it being replaced when they eventually get thir own laptops)