Well I Don't like Nothing at All the new Mazdaspeed 3.. for me they suck . no matter from where you see them.... and the engine aint s***... I don't understand how could mazda Change the RX-7 for an RX-8, the Protege for a Mazda 3. a Millenia for a Mazda 6... Honestly just imagine for a second a Redisign Protege how ******* bad ass would it be. AWD version. Bigger Engine I mean. I'll never Change my MSP for Any Mazdaspeed 3. and we are talking about 5 years of technology difference between them.. and I still keep my MSP... Its better Done than the MS3, Better everything. Suspension, Appareance, handling. braking. Inside. outside.. is not fast as a MS3, that don't matter. Power Without Control is uselss.. the ms3 is ugly i can't imagine how the sedan will look...... Protege is the best Compact Car that has ever exist. and the msp is the best handling production Car ever on Earth...
Almost sounds like you're bordering on sarcasm with some of those remarks, but I can't tell for sure.
However, having owned both a mazda3 and a MSP, and having driven both base and mazdaspeed trims of both platforms, I'm going to have to disagree.
The 3 is a very worthy predecessor to the protege. IMO, the 3 has about everything the protege has/had, but with a stroke of refinement added to it that's only natural to expect, given that it's had a couple years of evolution. The 3 has been praised almost universally for its handling and driving feel, and the MS3 takes that up another notch, performance-wise. Both the MZ3 and MS3 are in a league with significantly more expensive vehicles when it comes to handling, and certainly nothing to scoff at. That's speaking nothing of the monster power that the MS3 lays down...
I have several friends with both MSPs and MS3s. The universal opinion is that, disregarding the obvious mismatch in power, the primary difference between the two vehicles is refinement. The MSP is much more raw in its character and behavior, while the MS3 has more of a polished feel to it. Both cars are an absolute blast to drive (A couple of my MS3 friends actually occasionally ask if we can swap cars for a short drive), but their characters are quite different.
IMO, the styling of the MSP vs MS3 is a continuation of that theme. MSP has a very aggressive appearance package, from the gaping fogs/vents (depending on your model year) to the flashy color coices, to the oversized wing, it's continuing the raw and obvious sports-influence attitude. The MS3 on the other hand is done up in a much more subtle method that does not obviously bely what it's actually packing. With the exception of true red, the available colors are also quite understated (cosmic blue = perfect sleeper color).
So yeah, that's the biggest difference between the two generations of mazda's compacts: refinement. And given the vehicles that the MS3 is being routinely grouped against (Civic SI, GTI, etc), it's only natural that mazda would have stepped up that aspect.
And there's been a lot of arguing over whether the MS3 should've been a sedan.... but, well, the MSP and MS6 were both sedans... time to give the "wagon" a chance to strut its stuff. Besides that, the hatch body was kind of the differentiating body that really made the mazda3 stand out, appearance-wise.
Just my $.02