S.,
Women can be brutal sometimes, know that their intentions are good. For me, I can somewhat totally relate to you with this subject.
I would guess he's a little bored and maybe there isn't quite the routine for him. It isn't going to start with just you though, Dad needs to be on the same page especially with your son’s attachment to the ps3.
Maybe dad and you commit to 1 or 2 days a week of no TV or PS3 (at least while your son is at home or awake). Do something as a family, like cook something fun, bake cookies, art activities, build couch cushion and blanket forts or if your able to go to the local conservatory or zoo, most places like that are free in my area and we have indoor conservatories. Hopefully things like these will enable your son to be creative without the PS. Long term, build towards a daily routine from getting up, going to bed, to Sunday night family activities. Children actually want routine, and for our own sanity, they NEED it. As boring as it can be for adults, the routine allows a child to have a sense to what the day may bring, which is reassuring for them. It may be tough at first, but if you stick with it, your son is going to see, you will not be pushed over and that this is the way it’s going to be. So you may have to deal with an outburst or meltdown every now and then, for those days, time-outs in a chair for him and deep breath for you. Explain to him why he's time out "No PS3 today because we have other fun things planned but we need to be well behaved in order to enjoy them". Whatever you say, just be firm, it’ll be hard but you can totally do it.
Again, your sons father needs to be on the same page. I would guess, son is mimicking behavior from his dad. Dad should know the behavior isn't healthy for a 3 year old, hopefully he would understand and find times to play when your son is sleeping or not at home. You're going to have to stay strong and believe what’s right and healthy for your family and most of all your son. You can do it!
Good luck honey!