Good one, and I believe I commented on it very similarly in response to MDF in an earlier installment largely because I saw this coming based on the intro sequence.
The only bit I'd mention (which I covered before) is that there were possible scripts for the whole Freedy Vs. Jason showdown out there for years, not to mention tons of fan fiction and garbage on the subject. I think the problem is less than it wasn't everyone's paticular "dream match", so much as it was virtually noone's. While it's not as terrible as some people make out, when you consider that there have arguably been fan fiction writers who did better at convincing people of how it should be, that's a problem. Not to mention allegedly leaked scripts going back before the movie was actually ever planned that seem like they would have resulted in a better film.
Also for every clever bit, like Freddy duplicating Jason's mother, you have to wonder why all of a sudden Jason is hydrophobic which hardly seems to have been an issue with him before despite the drowning bit... or why dosing Jason with Sedatives would have knocked him out to bring him to the dream world to begin with. Questions like that cause problems with the movie. As awesome as the scene of Freddy dominating Jason in the dream world might be, I think half the problem is that fans had a problem acknowledging that Freddy could ever bring Jason there, at least using that method.
Oh and one other quibble, when it comes to the Friday The 13th movies, the FX for them was pretty bloody good for their day which is part of the selling point. I remember seeing TV specials on "how they did that" when they were a bit newer because visually some of the things they did were awesome... it was very much an "eye candy" movie for it's day. Also it should be noted that despite the terrible actors in them, one of the other things that caused them to succeed was that they had a lot of decent talent as well, including people that weren't yet famous. Johnny Depp, John Saxon (arguably a B-movie king, sort of like the Ron Pearlman of his day), and I believe Laurence Fishbourne has a supporting role in Nightmare On Elm Street 3. This can also be applied to some extent to "Friday The 13th" but not to the same extent or to where I remember it, but consider that even the goofier installments like "Jason X" had some decent people that wound up going places. If I remember Lexa Doig and the actress that played Beka on Andromeda (the name eludes me for the moment) were apparently both in that movie, and I remember them joking that "Andromeda" felt like a "Jason X" cast reunion with the ironic twist that the roles were reversed since Lexa played the Android/Ship Avatar in Andromeda, while Beka's actress played the robot in "Jason X". Say what you want about the acting and writing, but Andromeda managed to last five years, and Lexa Doig still seems to manage to pop up for small roles throughout geekdom. The point being that I think the casts involved in the single movies had a bit more talent sprinkled through them than they are getting credit for, and I'd imagine a few people had careers springboarded. You might be looking at some really bad dialogue and cookie cutter characters, but at the same time these movies succeeded because they managed to make it fun to watch, which does taken talent. Was it a bad actor, or a good actor with a bad script, or people just intentionally hamming it up because it's just that kind of movie. Look at say "Cabin In The Woods" Chris Hemmsworth is not a great actor but he's okay, even allowing for the premise (intentional cliques due to manipulation), you watch that and you might think he totally sucks, but at the same time it's pretty obviously intentional when you think about it and see that he's nailed a few other roles (including some like Thor, which might not be deep, but was apparently heavily contested)
