We went to Butlins for second time this year. We found it super clean, super fun and spent next to nothing while we were there.
I really do think it depends on what you want and what you do. We saw people throwing money into slot machines.... fine if you like it.... not for us.
Swimming was brilliant - didn;t really do flumes but loved the different pools and found changing areas very clean (I am a bit germ phobic - it was clean!).
I was made redundant so cheap was important for us. We took some easy to heat up meals i cooked double of the week before. Did this most nights but had fish n chips (£3.50 each for small fish, chips, drink and a side) and the buffet which was expensiveish but a real treat.
Entertainment was constant... and we loved it. DD aged 3+11 months LOVED it. Saw brilliant shows, loved all the music and had so much to do that me and DH were really happy too. Very relaxed - for example watching shows in skyline tent, sippin gon drinks while DD danced on the dance floor about 3 mteres away
What i was most pleased about was the amount pof planting adn greenary on site. I suspected it would be plasticy and tacky but it wasn;t.
If you want alazy, adult holiday in the sun - its not for you.
If you want some real fun with DS and enjoy watching him smile all week - it may be for you.
try it.... we did and loved it.