I own Bwii, so heres my opinion on it.
PROs:- Firstly, if you liked Battalion wars the first time around then you will love this one just as much.
-Action is fast and intense at times and online play is quite fun
-Unit variety and the fun in using planes bombers ships tanks and the grunt and most of these control schemes work with few screw ups.
-Online has Coop Assualt (objective based game) and Skirmish (kill as many as possible)
-Campaign is good difficulty, just about right.
CONs:-Campaign is too short (less than 12 hours for some players)
-Bounding box is far too small even on the "advanced setting" and sometimes takes away a bit from the games aiming
-Some people found online repetitive, i didn't, but just throwing that in.
- No leaderboards...
-(no voice chat, i assume you know about how stupid Nintendo has been)
Overall: not a bad game at all, good but not great. Voice chat could have changed that. Plus a server list like on MoHH2 would have been appreciated. so i would guess i would rate this game about an 8.0
Another game i would recommend is Medal Of Honor Heroes 2 (the aforementioned)
Pros:-32 online multiplayer....wow you should just go walk out the door now to go get it.
-Great control scheme beats metriod by a long shot deff. faster than my mouse and keyboard arrangement
-Intense online play with TeamDeathMatch DeathMatch and CTF.
-Good Levels to play on
-a blast to play
-Locked in at a constant 60 FPS
-Best online system yet on wii
CONs:- Wow, i really respect this game for control scheme but this is where you can tell the wii is too underpower, character animations are clunky at best. Movement look too smooth. (But really, as you play and really get into it you won't give a flying flip about what that dead guy you just shot looks like).
- It takes quite a few shots to kill, so your first few games you may find it hard to kill many, (trust me you get used to it, it gets very easy to be laying people out left and right after you get you play style perfected)
-Lack of Voice Chat
Overall: MoHH2 defines what the control scheme for future Wii first person shooter offerings. I would really like activition to dumb down the graphic from COD4 and put it out on the wii. My rating is an 8.5 a def buy for any FPS fan.
So if you buy both your in good shape.