I really enjoyed TNA when I first started watching it on Spike in 2005. It was nice to see something other than the WWE. But after a while they started bringing in too many of the wrestlers the WWE was releasing and throwing the title on them. And the backstage segments started really killing me, especially when Karen Angle showed up. So I just ended up stopping watching and only followed it on the internet.
Over the years it just seemed to be trying too hard to be the WWE's competition and get their attention (the Voodoo Kin Mafia angle, invading RAW once, trying to start the new Monday Night War
). Like the little brother who always does whatever he has to to get his older brothers attention and approval, just to even get acknowledged. And the WWE (like that older brother) really doesn't seem to pay any attention at all to the little brother. I really don't think TNA is a blip on the WWE's radar, ever.
I have seen some great matches in TNA, from their homegrown talents (meaning guys who weren't famous in the WWE before they came over). I remember a match of AJ Styles and Samoa Joe vs. the LAX at a house show in Oshawa in late-2007 that was AWESOME. And some great moves. Petey Williams 'Canadian Destroyer' is one of the best looking (albeit impossible) finishers of all time.
And another thing that keeps me from watching these days is the amount of commercials on Spike TV. I don't know if it's a regional thing but in Canada it's literally 50/50 commercials to program.