some of my own thoughts...
culver city: kinda cool if you're into playing where the old la kings used to practice. what really sucks is that the locker rooms are upstairs. there are also interesting places to eat around the area.
harbor city (torrance): they used to have the WORST ice around. they did fix it a little while ago and started up leagues again. they were offering pretty good deals to start playing there again. new thai restaurant "attached" to the rink with windows allowing you to see what's going on the ice.
both of the above have dank hockey rink odors with the accompanying ambiance... which i prefer.
el segundo (tsc): kings practice facility (as well as lakers and, ahem, the sparks). extremely high level at the very top (think ex-nhl-prospect washouts), but there are plenty of other levels available. you could potentially land on a team with a b-to-d-list celebrity. my roller teammate has alexi lalas (soccer guy) on his ice team. very nice facility all around.
lakewood (glacial gardens): 3 rinks there, but last time i checked were only employing 2 of 'em. they have (or had) some partnership with the anaheim rink, so you may have to play a game or two way out there... kinda inconvenient but it's f-ing hockey, right?!
roller hockey: regarding your roller hockey comment, there is a neighborhood (mar vista) around santa monica with an outdoor roller rink. they have free pickup on tuesdays, wednesdays, and thursdays. leagues available also.
all in all, contrary to what non-californians may think, there are PLENTY of opportunities to play hockey in los angeles. depending on the team, pretty authentic beer league experiences are possible too.