Addressing consoles on PC monitors. There is absolutely no problem playing them.. When playing hi-def games as long as your screen supports the resolution it will appear crystal clear. Probably even for the standard resolutions.
Its older non 3D hardware consoles (PSX/Saturn and lower) that have problems appearing grainy and pixelated.
Whether or not your laptop has inputs, well not for me to say...
My bro has a 40 something inch HDTV with component, HDMI input etc.. PC, consoles, whatever looks great on it, works just like a monitor when hooked up to a computer screen too. crystal clear high-res