The general rule in MK is that the estates with really straight roads are usually not great, and the estates with really bendy and winding roads are usually much nicer.

Most estates will have a combination of nice and not so nice bits, which actually averages out to most places being kinda OK. Overall MK is a good place to live, with lots of work opportunities, great redways, lovely green space, and not too dirty compared to other large cities.

There are a few places that are just considered pretty terrible, like fishermead, netherfields, fullers slade, conniburrow, etc.

Other than that it depends on what you are after. The areas directly round the city will be busier and noisier but also have easy access to the shops and public transport. Some of the flats they have built in the city would give you better access to the limited nightlife that we have here if that's what you are into.

Older places like wolverton can be really nice, but have limited parking and busy roads, so make sure the house you look at has parking that would fit your needs. If you are into cars this might limit you a bit. Stony Stratford is beautiful, but you'll pay for that beauty in the higher house prices. Newport pagnel is also older and pretty, but parts of it are VERY prone to flooding.

If you have kids you might want to pick based on the school catchment areas (most schools are fine, but naturally some are better than others). Luckily most estates have lots of green space and play parks for kids which is good. There are some (limited/isolated) issues with kids joining gangs, so make sure your kids don't get wrapped up in that stuff and they'll be fine.

Bletchley is kinda a place of its own. People I know who live there like it, people who have never lived their can turn their nose up a bit at the area. It can be a bit more run down than the other parts of mk, but it has some decent houses in places still.

This is all just my opinion of course.

Good luck with your move, I'm sure you will love it here.