The only company that really support competetive gaming is capcom. They have a loyal and dedicated fanbase that they support with their titles. Look at what they're giving us SSF4, TvC and MvC3. That is ****.
I think the OP should've used "Difficult" or "Deep" rather than "competitive". Or, at least that's the angle I personally understand it from. SSF4, and MvC3 have nothing on HDR and MvC2 as far as technicality and depth goes, because Capcom wants to make their new games (which happen to be fighters) more accessible to people who can't actually play games well, just like everyone else does. I can't speak on TvC because I haven't played it.
Here's a good example from Guitar Hero: they took out the most difficult part of TTFAF when they put it in GH: Greatest Hits. Like, in the time span from GH3 to GH Greatest Hits, they decided that difficulty wasn't making them money, so they would Nerf the **** out of the TTFAF note chart so that people could feel good about themselves and say they beat it on Expert.
Here's another example: In whatever GH is out now (I stopped playing because they're all too ****ing easy at this point), they put a Dethklok song (Laser Cannon Deth Sentence) in as downloadable. They also put a difficulty for drums called "EXPERT PLUS" in order to chart double bass. THEY DID NOT CHART DOUBLE BASS IN THE DETHKLOK SONG ON EXPERT PLUS because it was too difficult. DESPITE the fact that the difficulty only exists specifically TO CHART DOUBLE BASS. WTF. It makes my head hurt how stupid that is. They created a new difficulty to appeal to people who want difficulty, and then don't put all the notes in the song because it will be too hard. It makes me want to run up to the nearest living thing and kill it.
TL;DR:
Every new game recently has been easier than it's prequel. Example: GH created a NEW difficulty setting ABOVE EXPERT to appeal to 'hardcore' gamers (since the new ones are easy as ****), and then didn't chart all the notes in a song because it was too hard...
EDIT: @ Jam Stunna: The more that easy games are made, sold, and gain popularity, the more incentive there is for companies to nerf all their games in order to appeal to a wider audience, rather than strive to make an actually good, challenging, deep game. That's what the existance of ****ty games has to do with this. That's why Legendary in Halo 3 is a joke, in addition to the examples listed above. People who make games don't just ignore what's going on in the industry...