And they have got even worse since the Government launched its Funding for Lending Scheme last August, offering such cheap funds to banks and building societies that they no longer have to work hard to attract retail deposits.
Rates are so bad for savers that many accounts don't even beat inflation, meaning your money actually loses value in real terms.
So you might assume that this year's ISA season would be going with less of a swing and more of a simper, but you'd be wrong. In fact, savers are still keen to get their hard-earned cash into an ISA before the deadline.
Download this free guide on where to invest your ISA in 2013 here.
Only one a year
We each get an annual ISA allowance of up £11,280 for this tax year, which can either all be invested in a Stocks and Shares ISA, or up to £5,640 in a Cash ISA, and the rest in Stocks and Shares.
You can't carry this allowance over into next year, so if you don't open and fund an ISA by the end of deadline day on 5th April, your allowance is gone for good.
Because the end of one tax year marks the beginning of another, and because rates are so low, you may assume that it is no particular loss if you don't invest or save your annual ISA allowance this year.
After all, the best buy cash ISA rate is only 2.5%, and if you invested the full £5,640 you would get a return over the year of about £142 on your money. Basic rate taxpayers would have therefore saved £33 over the year compared to having their money in a standard, non-ISA savings account. Hardly sets the world on fire does it?
But there is still one very good reason to use your allowance if you have the spare cash.
As long as you fund your ISA by the end of the tax year it remains tax-free, forever (unless a future Government changes the rules). What this means is that you can build up a sizeable tax-free savings pot, and the whole lot remains tax-free, not just that specific year's allowance.
This is important because while interest rates are currently low, they won't stay low forever, and when they rise, you will be able to enjoy tax-free savings interest on your entire ISA pot, year after year. If you save your money outside of an ISA, you will be taxed on it, year after year.
Nicer with an ISA
Indeed low rates have failed to put off savvy savers who are rushing to make their most of their tax free allowance while they can.
According to National Savings & Investments 24% of Brits will take advantage of their full ISA allowance this year, while 18% will at least use some it.
And only 9% are put off by poor interest rates and returns, compared to 30% in 2010.
Michael Ossei, personal finance expert at uSwitch.com, says: "Savers are having to make do with the lowest returns in years and they are obviously not happy about it. Yet despite this, they're flocking to cash ISAs in their droves with a 26% increase in the number of savers this year compared to last."
John Prout, National Savings & Investment's retail customer director, adds: "ISAs are usually the first port of call for people looking to save and it's encouraging that almost half of us are utilising the tax-free shelter that ISAs provide. With the end of the financial year fast approaching, now is an important time for everyone to review their savings."
So if you want to make the most of your ISA allowance, where do you start?
Stocks and Shares ISAs are more complicated than cash versions and it's important to remember that they are investments, so your return is not guaranteed. If your ISA drops in value you could actually lose your money, however of course there is also the potential to make a decent return.
You may want to consider taking independent financial advice if you are contemplating an investment ISA.
With a Cash ISA your money isn't at risk, but the returns are limited. And in the current climate they are particularly poor. Instant access ISAs work like a standard savings account, where you get paid a rate of interest and you can withdraw money as and when you want. At the moment the best buy rate is 2.5% from Cheshire Building Society, but you need a minimum balance of £1,000 to bag this deal.
If you want to benefit from a higher rate you could choose a fixed ISA, where your money is locked in for a set period. For example you can achieve tax-free savings of 3% with Halifax's three-year fixed rate ISA.
As you can see, even the very best rates are not particularly exciting, but remember, you only get one ISA allowance a year, and if you don't use it, you will lose it.