I agree with Mendacious to a large extent.
Here's my OToolkit graph of the ~11k hands that I spent at FullTilt. About 80% of the hands are split evently between $100 and $200 PLO8.
Unusually, I ran below my Sklansky line at FTP (I'm usually a moderate to large luckbox). My overall net was somethingl ike 2 bb/100 during that period of time. If I ran approximately at my Sklansky line, that would put my BB/100 at arond 5.
That was playing my usual relatively TAG style of VPIP 20, PFR 4, and AF-Tot 2.6. It's interesting to contrast my red Sklansky line with my green results. The nice slope of my Sklansky line shows my playing style results in plenty of equity advantage situations. However that comes at a heavy price as you can see in my green lne. I'm getting robbed of a lot of my Sklansky dollars during the non showdown hands due to the generally more aggressive nature of the games.
So I agree that the games certainly feel tougher at FullTilt. I think they're still beatable, but to a much lesser degree than the glory days at Party. Bottom line for me, I've cashed out of FullTilt until they offer another reload so I can take advantage of their combined 60% rakeback through bonus + rakeback.
PS, sorry for all of the edits. I just wanted to add that I realize my sample size is limited but the OToolkit helps filter out at least some of the short term variance by the different colored lines.