TNA Impact is a game which has recieved plenty of criticism for its "crappy" storymode, the apparant fact that story mode is too difficult & that the only good factor is its graphics.
The storymode itself isn't amazing, and contains too many jobber characters to be anything more than average if done more than once. The lack of variation makes it stale, and the arcade type consequences of losing a match make it more like Tekken than TNA.
To those of you who find storymode hard, I too had bad points where it took up to 15 attempts to beat someone. Then once I'd done it I realised how simple the stratergy would have been if i'd just used it in the first place instead of trying the same one for EVERY match.
The graphics are the only thing that make this game superior over SVR, because the movesets are very limited but thats a factor which can be ignored if your enough of a TNA fan. Fortunately, for me thats a case I can relate to.
The online mode is lacking in game types, but its fun and challenging to face other people in 1 v 1 matches because its quite easy to counter people who use cheap tactics like chair swinging. The huge flaw is the fact that people can quit the moment they know they dont stand a chance (for games against me that becomes apparant after 30 seconds at times :P) - and recieve no punishment other than maybe a bad rep on XBL.
Overall, I consider getting this game if the pros outweigh the cons - but for people used to SVR...I say stay with that. Two completely different systems of play which can result in the same thing - fun ;)