Ok I did go buy it and have put in a couple hours, here are my thoughts.
1) Its the best motion based core video game on Wii, by a rediculous margin. As far as delivering an awesome good time it also beats Zelda TP, MP3 Corruption and pretty much every other core title from Nintendo except for Galaxy. I'm a huge Galaxy fan personally.
2) The sword controls are different (less tactile for sure) from Wii Resort, BUT, thats completely ok within the RS2 design. What RS2 does is weave the gunplay and swordplay together flawlessly, Sports Resort style swordplay could have easily introduced flaws into that core flow. So far in my play time proper sword blocking is grossly under utilized though, hopefully that changes later on. The base swordplay design found in Wii Resort is superior imo to the method used in RS2, but the fully realized Wii Resort design is no where near as complex as the fully realized RS2 design.
3) RS2 is already having a subliminal effect on my mind. I saw a God of War 3 commercial about 20 minutes ago and my gut reaction without thinking was that it looked absolutely rediculous. Here was this epic crazy battle going on on screen, and then you have this comatose guy sitting on the couch barely moving a muscle. I experienced a complete cognitive disconnect from the old school. I have seen the exact same commercial for weeks now and never had that sensation until today.
4) I WANT MOAR GAMES FOR M+!!!
Edit: as for how RS2 could get a 3/5... Its because the whole review system is nonsensically broken at this point. I'm sure RS2 lost points for not having story elements or having a bit too much load times or stuff like that. Its a bunch of semi intelegent people missing the forest and writting about the trees.