I'm going to be completely honest: WWE Monday Night RAW sucks. It's bad television. It has been that way for at least a year, sans one or two moments, which don't make up for the ridiculous amount of time given to us that is just terrible programming but I would argue it has been that way since about 2005.
That being said, the one constant question that comes up over the years is "if it sucks, why do you watch it?" and then people/posters try to make comparisons to other television shows like it's the same thing. "If Will & Grace sucks, would you keep watching it?" It's not the same thing. Will & Grace doesn't dictate, control and influence the ENTIRE industry that it is in.
You know why, even when I know that it will be bad, that I continue to tune-in to WWE Monday Night RAW, without fail, damn near every single week? Because I am a wrestling fan and, like it or not, RAW dictates the wrestling world. It is the wrestling show. The A-show from the A-company. Without RAW, you're out of the bubble for a week. If I miss RAW, I don't feel like my opinion is as valid around the internet on various message forums. Without RAW, a lot of the podcasts and radio shows that I listen to don't make as much sense or are talking about things that I didn't see. Without RAW, I always feel like I'm a week behind and can't catch up until I watch RAW.
Also, there's always the possibility, even if it seems to get slimmer and slimmer over the years, that WWE does something incredible that you don't want to miss live. I missed the C.M. Punk shoot interview last summer when it happened live and I kicked myself for missing it for quite some time. I had to watch it later on YouTube and it wasn't the same. I missed the immediate excitement over it and all my friends talking excitedly about it. Even just that first initial fifteen minute rush that came post-show, I hated myself for fucking up. I saw the debut of The Nexus live and it was great. I don't want to miss moments like those, when they happen live, regardless of how it plays out down the road.
I have been watching wrestling since, oh, 1987 or so I guess. I have been posting/talking about wrestling on-line since the end of 1998. Over that time, from 1987 to today, I have seen a lot of wrestling. WCW, ECW, TNA, AWA, NWA, Mid-South, Smoky Mountain, Memphis, AJPW, NJPW, CMLL, AAA, NOAH, FMW, XPW, Shimmer, SMASH, shit from the 50's, 60's, 70's, 80's, 90's... you name it. The one constant is that RAW will be on TV on Monday night and for better or worse, most wrestling fans will be watching it.
THAT is why I watch RAW.