The best part about comic book format is that the scale completely changes. *spoiler* Please don't tell me that there was any way they could convincingly animate a giant Mecha Dawn or Dawn the Centaur on TV. Not EVER going to happen (at least not to the quality of "dusting a vamp" as we saw in later seasons). In reality, I think some of the fan base would have been lost right there if the TV show had tried. A person is hard pressed to suspend disbelief on things like that in a live-action format. Not to mention the cost is huge.
I think it's fantastic that the writers and artists get a chance to move the characters into huge-scale locales and visit unimaginable demons and have battles with a cast of thousands. These are things I love to see in my fiction reading.
I think the biggest complaint I've heard is honestly the once-a-month drip-drip-drip pace of the comics. However, after 6 years of absence, even a current storyline once a month has got to be somewhat satisfying, yes?
... Ignore the scary comic book guy. Trust me, he has his niche and he's not going anywhere. They don't normally bite and are already familiar with rejection (just in case one asks you on a date). And sometimes you get lucky, find a good one, and marry him like I did!