You would think Soundwave would be the one with a war injury that would prevent him from talking, if anyone has to. Not Bumblebee.
Soundwave is more musically inclined anyway, he shouldn't have a mouth like they say he will (and his face plate could be part of that "war wound"), and his cheesy robotic voice might seem ridiculous by today's standards. So if anyone has to be a mute-except-through-music, it should be Soundwave.
I guess the whole Bumblebee-not-speaking-except-through-his-radio thing is part of the whole human perspective of discovering the Transformers, and confirms that Bumblebee will be among Sam/"Spike"'s closest friends, but I think there could be a better way around it. Supposedly Bumblebee changes forms later, according to the review you linked to, hopefully to a properly speaking Volkswagon Beetle! But maybe something so simple is still asking for too much.
More dialogue for the Decepticons, please. Starscream with only two lines? That's only slightly better than Darth Maul, for crying out loud. I can understand how they'd bother with a few non-conversational Transformers but Starscream was always a major part of several storylines and continuities. Maybe we don't want to explore his whole desire to be Decepticon leader thing in the first movie, but he could at least have a bit of back-and-forth banter with Megatron, or ANYONE, for that matter. Two lines. Sheesh. If Starscream doesn't say much and most Decepticons don't say much at all, they could easily add a couple more Decepticons by palette-swapping the model for Starscream to create Thundercracker and Skywarp. Cheap, yes, but in my mind, preferable to the current Decepticon line-up. The action probably involves their alt-forms to a great degree, though, so grounding most of the Decepticons makes things more fair. Oh, except Megatron is a jet too. *sigh*
I'm sure they wouldn't've gone for a live-action shot-by-shot recreation of "More Than Meets The Eye" (the first three episodes of the G1 cartoon) for a number of reasons but I think they could've kept things more true to the show (or other established continuities like the comics, even), especially the Decepticons.
RANT RANT WHINE WHINE, right?
(Judging by what people are able to come up with these days, someone may get around to making their own Transformers live-action fan film one day, I'm sure.)