In this review of Call of Duty: Black Ops, I'll focus on Wii's online multiplayer since I haven't played the campaign yet and since most people play the game for the multiplayer experience, anyway.
My review's title says it all: this is definitely the best FPS experience on the Wii so far! The guys at Activision/Treyarch really push the envelope in terms of in-game features and graphics on the Wii. Most features from its 360/PS3 counterparts are present, such as Contracts, Wager Matches, and Zombie Mode, and all of the Perks, maps, weapons, and achievements are the same, as well. A few Killstreak Rewards, such as the Valkyrie Rockets, Chopper Gunner, and Gunship, are absent due to the Wii's technical limitations, but the rest of the Killstreak Rewards are included. Also, the Wii version has the same multiplayer modes as the other versions, and there are certainly a lot of them, including Team Deathmatch, Capture the Flag, Domination, and Free-for-All (there are still others I think), as well as the new Wager Match modes such as One in the Chamber, Sticks and Stones, Gun Game, and Sharp Shooter. In Black Ops, you can earn CoD Points for the first time that will allow you to purchase all of the Perks, Killstreaks, weapons, attachments, and camouflage after you unlock them. This gives the game a more satisfying and balanced feel because you must unlock upgrades by leveling up and then buy them with CoD Points instead of simply earning then from leveling up.
The graphical component of this game on the Wii is certainly a noticeable (however small) step up from its predecessor Modern Warfare: Reflex, but it still won't rival that of the 360/PS3 for obvious technical reasons. Even so, the game looks pretty. The maps are well-detailed and expansive - much more so than any other CoD game on the Wii. I often find myself getting lost amidst the intricately-designed outdoor areas and buildings of many of the levels. The map "Jungle," for example, has a good deal of lush greenery, cliffs, trails, and shelters that are ideal for hiding and stealth combat. Of course there are smaller levels, such as "Nuketown," that are ideal for close-combat fighting, but it's the huge, complex maps such as "Jungle" and "Array" that I find the most fun and suspenseful.
As far as online connection is concerned, I've had minimal issues with the Wii version. Most often my connection is very fast and smooth. The only issue I've experienced is getting disconnected from games immediately after they begin, but this happens very sparingly (only once so far in the four days I've had the game) and seems to last only about ten minutes or so. I should also mention that apparently the Wii version has DLC and patches just as the other versions do, so you'll be able to download new maps and updates for the first time.
Black Ops marks the first Wii Call of Duty game in the franchise to support online chat, too. The company PDP teamed up with Activision and Nintendo and made an excellent peripheral: the Wii Headbanger Headset. If you want to participate in online multiplayer voice chat, then this is a must-have because the game does not support Wii Speak. The headset works flawlessly; the sound is crystal-clear and does not lag or break up. Unfortunately, not too many people who are online are using this neat device yet, but hopefully more people will get one once they learn about it. It's not available on Amazon yet (it says November 18), but it's available directly through PDP's website in a limited-edition Black Ops version or in a traditional white version for $24.99. I ordered mine this way and received it quickly and with no hassle.
The main selling point of the Wii version is definitely its smooth controls using the Wii Remote. The controls feel about the same and are just as customizable as those from MW:R. This is area in which I feel the "Wii, Xbox 360, or PS3?" question has a clear-cut answer: if you like the motion controls, then go with the Wii version. I must mention, though, that the Wii version does support the Classic Controller Pro this time around, so if you're into the shoulder triggers and thumbsticks, then there is an alternate option for you!
The bottom line: Call of Duty: Black Ops is a fantastic game if you're into online multiplayer FPS games, and it's undoubtedly the best one the Wii has to offer. You'll get hundreds of hours out of this game with all of its multiplayer modes and unlockables. If you're not into Wii's controls and slightly downgraded graphics, then the Xbox 360 and PS3 versions are the clear choices for you. If you like the Wii's controls and don't mind the slight graphical difference, then I promise you that you're in for some major fun and that you won't be sorry with this game!