I'd say it hugely depends on what you want to do in the game.

I started on PS3 as a PLD (tanking since 2004) and had very little issues, however in the higher-end content you can definitely be a burden. You can mitigate that by "learning" a fight (like counting towers when Titan HM will do plumes and stuff), but at least for my experience (decent pc via LAN, Ps3 via W-Lan, DSL 6k) I can definitely mitigate a ton of damage on my computer that I would take on P3 (thats also the reason I'm not tanking on my PS3 at all anymore).

So you might want to test how good you can dodge AoEs on your PS3 as it might differ for you from my experience

You can easily notice that by trying to "last second evade". When I dodge late on my computer and move just barely outside of the AoE I get hit very very few of the times (like 10% maybe), when I dodge correctly I get hit below 1% I'd say (spikes still hurt you of course^^).
On my PS3 when I do the late-minimum-dodge I easily get hit 50%+ of the time and even when I'm concentrated and act fast I'll at least get hit 10% of the time if not more.

This might be due to WLan though, so test for yourself and you'll see

Also note that not being able to dodge will still be fine in most cases for 4man content, so don't worry too much if you don't wanna go highend content even if you have the same problems I have.