Come to the conclusion Bay either got really lucky on the first film or this new 3rd writer isn't worth his salt.
Should start by saying I wasn't a huge fan of the cartoon so G1 representations etc mean diddly squat to me, but I was a fan of the first film.
Things that bugged me:
Innapropriate humour. I'm not aiming this at the twins per se, but the film is crammed with moments that shouldn't of had cheeky or cheesey humour added. Some of it is forgivable, when involving Sam's parents for instance, a lot of it is cringe worthy, however.
Inconsistency. I'm sure i'll be laughed at for thinking the first film followed a standard line of acts, but this was messy compared to its predecessor. The first hour or so is fine, but as someone else stated, at the point Jetfire gets introduced, crap falls apart and it becomes a mess of dust, robots, and random fight scenes.
Too many robots! Again, this seems like a typical Hollywood response a la Jurassic Park - add more of what makes your movie 'your movie', and you'll be certified a sucessful sequel. Bzzt. Wrong. Going from the 11 or so robots in TF1 to probably 40 or so that have no development or explanation is not only frustating to follow, it's not necessary. It's like it's been done for the sake of doing it.
Autobots not getting used. I used the 'excuse' that the first film took a lot of time to get the characters up to speed to make you invested. You care about Bumbleebee and Prime especially, and Ratchet and Ironhide grow on you by the end battle. They are completely sidelined in favour of numbers. I was actually quite pissed off that every time I thought Ironhide showed up to do something cool, he either faded into the background or got slapped out of the way.
Sam 'dying'. Any injury sustained that makes your heart stop clearly is enough to keep you down. Getting up and waltzing over to Prime and hugging Mikaela just felt wrong. The dude has shredded clothing and a mangled face when he's laying on the ground, then after a brief out of body experience seems completely fine.
Jetfire. I just think the film could of done without him completely, or at least given him a bit of pride. It was almost like watching Grandpa Simpson fumble his way around a plot, and I didn't enjoy it.
People clapping at the end. Seriously? I didn't think we did that in England.
Things I enjoyed:
Bumblebee and Prime. Same great characters from the first film. One of the tear jerkers involved Prime being beaten in a fight, was a true 'fall of a hero' moment.
The parents. I think we all enjoyed them from the first film, and there's a little more balance to them here, actually being used. Again, another tear jerker moment occurs with them and Sam, which is probably why they're so prominent in my mind.
Megan Fox.
t:
Overall - could of been way better, could of been a hell of a lot worse, though. It's not the action epic Transformers film that the first entry in the series would of lead you to believe it was building up too, but it's a competent 2nd chapter compared to the likes of Attack of the Clones, for instance. Overall i'd probably say it's worthy of a 7.
For me to rate it any higher they'd of really needed to trim down both sides of the conflict, remove the Fallen as a PHYSICAL enemy and leave it in the hands of Starscream
heart
vs Megatron, and stop with the camp humour at every possible scenario. I didn't mind the little toy car decepticon (Wheelie? Not sure it's ever mentioned) but as I stated by the end of the movie I was actually hoping the twins and Jetfire would be killed off asap. There's a lot of stuff happening just for the sake of it, which when you're pushing a 2.5 hour film and it has a lot of more important things it could cover, really starts to get on your nerves.
Next film? Politics. They touched on the idea of "what do the governments of the world have to say about alien robots kicking the crap out of each other on our planet?" and the politics involved in asylum for Autobots and invasion from Decepticons, but I'd really love to see them evicted and returning to stop something like Unicron in a combined force.