I'm probably more sensitive to rainbows than most, but I rarely find them a distraction when gaming on a dlp, even with slower 4x color-wheel speeds. I suspect it's because playing a game is a much more active viewing experience; you're not laid back analyzing/scrutinizing the PQ as much, you're focused on the game. Cutscenes are about the only time I notice them with PS3 gaming.
I gamed using a Sony SXRD FP for years. I put thousands of hours on the machine with multiple PS3s (first gen experienced the YLOD after a few years). I don't know about PS4 games yet - waiting for more games or a better deal than full SRP, probably get a package bundle this fall - but PS3 games have a rather finite resolution, much more so than CG animated movies, so you're not going to see much difference in terms of detail between DLP and SXRD, unless one machine does a better job of deinterlacing/scaling than another, as most games PS3 games are 720p, rather poorly converted, and overcompressed. I'd say the only material you're likely to see more of a resolution difference from will be 1080p BDs of live-action films. Though, I wouldn't call the difference with movies any kind of profound, at least not with SXRD. SXRD may be softer, but it's not "soft" by my definition, unless the panels are severely misalligned. Basic LCD might be different, but I can't remember spending enough time with any LCD FP to qualify any kind of comparison there.
As for lag, the only lag I've every been bothered by while gaming was with online multiplayer and the rather unreliable DSL internet service from windstream. For a couple years we had a severe problem with losing packets and infrequently non-existent speeds. They finally upgraded their equipment, and fixed most of that, but they've still oversold the service in our area, so our connection still randomly drops out for a few minutes, almost daily. With single-player, lipsync issues have never been a problem with either of my last two Sony SXRDs or my current Mitsubishi DLP - which I don't even use the game mode for to decrease latency - so I'm not really sure what all the fuss is about regarding display lag.
Chad Varnadore <><ex-armchair quarterback***************Our HT