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Blogger Blogs are run by Google, which probably everyone knows, at least everyone who uses blogger knows.
Hence we can expect a high quality from Blogger, we can expect high quality from anything that Google gets involved in.
Blogger is a free hosting service from Google but it has UNLIMITED BANDWIDTH, that means it can be online without any problem, even if you have over a million visitors at once on your blogger blog.
So do not worry about Bandwidth of Blogger Blogs.What you do need to worry about is the space for the images that you upload, up to 1GB it is free.
After that you need to pay for image hosting from Picasa web albums which have tied up with Google.
After crossing the limit,


10GB for 20-25$ a year
40GB for 75-80$ a year
150GB for 250-260$ a year
400GB for 500-510$ a year
Not 100% sure of prices


And also when you have a lot of images, and you get hundreds of thousands of visitors at once, the blog may not work properly as image hosting is not Bandwidth free.
But for a free hosting service, this is really good deal from Google for its Blogger blog users.
This is the big advantage of Blogger, even some paid services which charge a lot for hosting do not give you unlimited bandwidth, also they may have server downtime, during which your website would not work, but Blogger has no server downtime as well.

This unlimited bandwidth is applicable to standard blogger templates, which you get the options of in Template designer.If you are using custom templates then you may experience lags and slow loading time during large surges of traffic.