I loved it, I look back on my time with the main trilogy, plowing my way through legions of bad guys in single player and then doing so in co-op with a close buddy and then the hours of multiplayer in Halo 1 and 2 and eventually 3, as some of the best times in my gaming life. Of course it's not the greatest game in existance but the fact remains that such a game really cannot exist in a world of personal taste. Whatever, I have yet to properly sit down and play Halo Wars, but the four games by Bungie have so far proven themselves to be great fun and I look forward to Reach.
Also, I actually enjoy the story aspect largely because I can see some of the referance points but mostly because, with a certain character in Halo 2 in particular, there was clearly more on the developers mind then just 'make the aliens all evil' and don't you dare pretend you don't know which character I'm talking about here.