Well now that I'm back from my vacation and having logged over 100 hours in the MCC (campaign only, haven't even bothered trying MM apart from one ill-fated game with a garbage team of randoms), I can say that I'm a bit sweet and sour on it.
On the one hand, I've logged over 100 hours on the campaign alone. Loving the challenge of the par scores. Loved the challenge of the 3-hour campaign speed runs, although without sword cancelling/sword flying I think they need to up the threshhold for Halo 2's speedrun to 4 hours. I don't think much thought was truly put into these achievements because they're all the same (3hrs for all campaigns, 25k points for all par scores, even though the levels vary VASTLY on the attainability of these scores).
On the other hand, I cannot play Halo 2 Anniversary online co-op AT ALL. It just doesn't work. Halo CE, 3, and 4 work and are usually solid if playing 2player, but 3 and 4 can bog down considerably depending on who I'm playing with if I try to play 4-player.
But Halo 2? Broken and unplayable (for me) in online co-op. It's not my NAT. It's not my connection speed. It just doesn't work. Yet my two friends have been able to get it to work, not without crashes and disconnects, but they're at least making progress on speed running levels on Legendary. Me? Nothing. I don't get how it can be broken and not work for some people, but only semi-broken and *mostly* work for others. Just doesn't make sense.
So yeah... I'm both pleased and disappointed. I've been absent from the forums because I've been playing so much, but now that I'm back at work I'll be back on here. Hopefully the online issues get resolved and we can get some GAF customs nights going. Not even going to bother trying to resurrect my online customs thread, as no shits could be given by most people for that thread. But I look forward to consoling one another while the game is broken as it is now, and playing with each other (if)when it becomes stable and all that.
Edit: And if anyone cares, the achievement walkthrough is complete (apart from par-score and par-time videos which I think are unnecessary but may be added in the future). A link in the OP would be great, but I doubt it will happen. You can see it on TrueAchievements.com by clicking on the Walkthrough link at the top of the Halo: TMCC page. I'm sitting just shy of 3500 gamerscore so far and have around 85-90 achievements remaining to obtain. I made youtube videos for all the collectibles and easter egg achievements, and some of the not-obvious miscellaneous ones.
Also, and this is the big one (if you don't think it's too broken to bother). I'm giving away FOR FREE a Collector's Edition copy of the game that I imported from GAME.UK. It's about a $90 retail value in the states after importing and shipping and all. I posted a video explaining how the giveaway will work on my KorbeKGaming youtube account. My account is NOT monetized on twitch or youtube, so no annoying ads. I'm just doing the giveaway to give back to the gaming community that has given me so much over the years.