Are you going to provide the money for an upgrade? No? Then shh.
I'm sorry to say this but you shouldn't byte more than you can chew. We all WANT things. Whether we can afford them or not that's another issue. This game is a new gen game and you are playing it because Bioware did something nice and ported it on your console. You should know better than to expect new gen games to work on old gen hardware.
Let me put it this way:
The xbox 360 has got a 7800gtx equivalent Graphics card.
Spec: 400 MHz, Direct X 9.0, 256MB GDDR3 SDRAM,
The ps3 has got a 7800gtx equivalent Graphics card.
Same spec as above
Both consoles have had their GPU stripped off some parts to make it work in the console and both of them render games at 720p which is then stretched to fit a 1080p screen.
This game is a new gen game that requires at least:
Geforce 8800GT for minimum / very low settings only
Geforce GTX650 for medium / most options off
Geforce GTX660 for RECOMMENDED SETTINGS / decent gameplay
------------------------------------------------------------------------------------------------------
You should consider yourself lucky that you even have access to this game on the old console and they tuned everything down to make it work for you.
The gameplay in the videos you see on youtube is all from High End PC's. Ppl who run this game with latest high end GPU's with spec such as 3GB DDR5 / 6GB DDR5 / 8GB DDR5. That is millions of miles away from the 360 or the ps3.