Looks like you already decided to give it a go, but I'll add my 2 cents for anyone in the future with the same question. That is, after all, the reason forums exist! To ask and answer questions.
I always loved M&B. The game blew me away when it came out, but it was so easy. Even with the difficulty all the way up you could cakewalk it. This mod gave me FITS! Just when I got mad enough, they gave me an achievement for failing! It made me lol (nice dress!).
I've been playing this every day for the last 2 weeks and I can't wait to get home from work. I'm on day 900 something on my first attempt and I feel like I'm only in mid-game. I never played native that long, ever, and I often come back to M&B as a fallback game.
About the only disappointing thing I've encountered is how I squandered my freebie qualis gems early on, on stats. Now I can't start my Knight Order until I find another one. I see Boris the Raven on the list of armies, and man I scour Pendor for him, for 2 months and doing Noldor tournies as well, only to see someone killed him. I feel like I can't take on the bigger guys until i start my knight order, etc. So I'm in a slump, but I'm trying hard to get out of it. So it's more of a game intrigue than a disappointment really. I'm gonna try to kite K'juda into some Noldor or something lol.
I've literally been gaming since Pong and I know good games. This mod is out-freakin-standing. I could go on about the features, but it's better to let those features slap you in the face when you play it.